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HT48CXX/HT48RXX 8-Bit Microcontroller Series
Features
* * * *
* * *
Operating voltage: 2.4V~5.2V Bidirectional I/O lines with a selection of 18, 22, 32 and 56 lines One interrupt input Programmable timer/event counters with overflow interrupts and a selection of one 8-bit counter, one 8-bit and one 16-bit counters, or two 16-bit counters On-chip crystal and RC oscillator Watchdog timer Program ROM with size selection of 1Kx14, 2Kx14, 4Kx15 and 8Kx16 bits
* * * * * * * *
Data RAM with size selection of 64x8, 96x8, 160x8 and 224x8 bits Halt function and wake-up feature to reduce power consumption 63 powerful instructions Up to 0.5s instruction cycle with 8MHz system clock at VDD=5V All instructions in 1 or 2 machine cycles 14-bit/15-bit/16-bit table read instructions 2-level/4-level/8-level subroutine nesting Bit manipulation instructions
General Description
The HT48C10/48C30/48C50/48C70 are 8-bit high performance RISC-like microcontrollers, specifically designed for multiple I/O product applications. These devices are suitable for use in products such as remote controllers, fan/light controllers, washing machine controllers, scales, toys, and various subsystem controllers. They all contain a halt feature to reduce power consumption. The major differences between these microcontrollers are attributed to variations in sizes of the ROM and RAM, as well as bit number, counter number, I/O line number, and different level subroutine nesting. Roughly speaking, the HT48C10 is a microcontroller with most economic features and the HT48C70 is one with the most features of the four microcontrollers.
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Selection Table
Mask version
Part No.
Operating Voltage External Interrupt Internal Interrupt 8-bit Timer/Event Counter 16-bit Timer/Event Counter System Oscillator Watchdog Timer ROM RAM I/O Lines Instructions Stack Levels Operating Frequency Power Down Mode Table Read Instructions
OTP version
HT48C10
2.4V~5.2V 1 1 1 0 Crystal/RC 1 1Kx14 64x8 (40H~7FH) 18 63 2
HT48C30
2.4V~5.2V 1 1 1 0 Crystal/RC 1 2Kx14 96x8 (20H~7FH) 22 63 2
HT48C50
2.4V~5.2V 1 2 1 1 Crystal/RC 1 4Kx15 160x8 (60H~FFH) 32 63 4 400kHz~8MHz

HT48C70
2.4V~5.2V 1 2 0 2 Crystal/RC 1 8Kx16 224x8 (20H~FFH) 56 63 8 400kHz~8MHz

400kHz~8MHz 400kHz~8MHz

Part No.
HT48R11 HT48R12 HT48R31 HT48R32 HT48R50 HT48R51* * Under development
VDD
3.0V~5.2V 3.0V~5.2V 3.0V~5.2V 3.0V~5.2V 3.0V~5.2V 3.0V~5.2V
fSYS
400k~4MHz 400k~4MHz 400k~4MHz 400k~4MHz 400k~4MHz 400k~4MHz
I/O Pull-high
No Yes No Yes Yes No
Mask version
HT48C10 HT48C10 HT48C30 HT48C30 HT48C50 HT48C50
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Block Diagram of HT48C70
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Pin Assignment
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Note:
For the dice form, the TMR0 and TMR1 pads have to be bonded to VDD or VSS if the TMR0 and/or TMR1 pad are not used. The (TMR0) INT indicates that the TMR0 pad should be bonded to the INT pin. The PC5 (TMR1) indicates that the TMR1 pad should be bonded to the PC5 pin.
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Pin Description of HT48C10
Pin Name I/O Mask Option
Wake-up Pull-high or None
Function
Bidirectional 8-bit input/output ports Each bit can be configured as a wake-up input by mask option. Software instructions determine the CMOS output or schmitt trigger input with or without pull high resistor (by mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without pull high resistor (by mask option). Negative power supply, GND External interrupt schmitt trigger input with pull high resistor Edge trigger is activated during high to low transition. Schmitt trigger input for timer/event counter Bidirectional 2-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without pull high resistor (by mask option). Schmitt trigger reset input, active low Positive power supply OSC1 and OSC2 are connected to an RC network or a crystal (by mask option) for the internal system clock. In the case of RC operation, OSC2 is the output terminal for 1/4 system clock.
PA0~PA7
I/O
PB0~PB7
I/O
Pull-high or None -- -- -- Pull-high or None -- -- Crystal or RC
VSS INT TMR PC0~PC1 RES VDD OSC1 OSC2
-- I I I/O I -- I O
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Pin Description of HT48C30
Pin Name I/O Mask Option
Wake-up Pull-high or None
Function
Bidirectional 8-bit input/output ports Each bit can be configured as a wake-up input by mask option. Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Negative power supply, GND External interrupt schmitt trigger input with a pull high resistor. Edge triggered is activated on a high to low transition. Schmitt trigger input for timer/event counter Bidirectional 6-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Schmitt trigger reset input, active low Positive power supply OSC1 and OSC2 are connected to an RC network or a crystal (by mask option) for the internal system clock. In the case of RC operation, OSC2 is the output terminal for 1/4 system clock.
PA0~PA7
I/O
PB0~PB7
I/O
Pull-high or None -- -- -- Pull-high or None -- -- Crystal or RC
VSS INT TMR
-- I I
PC0~PC5
I/O
RES VDD OSC1 OSC2
I -- I O
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Pin Description of HT48C50
Pin Name I/O Mask Option
Wake-up Pull-high or None
Function
Bidirectional 8-bit input/output ports Each bit can be configured as a wake-up input by mask option. Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Negative power supply, GND External interrupt schmitt trigger input with a pull high resistor. Edge triggered is activated on a high to low transition. Schmitt trigger input for timer/event counter 0 Schmitt trigger input for timer/event counter 1 Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option). Schmitt trigger reset input, active low Positive power supply OSC1 and OSC2 are connected to an RC network or a crystal (by mask option) for the internal system clock. In the case of RC operation, OSC2 is the output terminal for 1/4 system clock. Bidirectional 8-bit Input/Output port. Software instructions determine the CMOS output or schmitt trigger input with or without a pull high resistor (by mask option).
PA0~PA7
I/O
PB0~PB7
I/O
Pull-high or None -- -- -- -- Pull-high or None -- -- Crystal or RC Pull-high or None
VSS INT TMR0 TMR1
-- I I I
PC0~PC7
I/O
RES VDD OSC1 OSC2
I -- I O
PD0~PD7
I/O
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Pin Description of HT48C70
Pin Name I/O Mask Option
Wake-up Pull-high or None Pull-high or None -- -- -- -- Pull-high or None -- -- Crystal or RC Pull-high or None Pull-high or None Pull-high or None Pull-high or None
Function
Bidirectional 8-bit input/output ports Each bit can be configured as a wake-up input by mask option. Software instructions determine the CMOS output or schmitt trigger input with or without pull high resistor (by mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option). Negative power supply, GND External interrupt schmitt trigger with pull high resistor Edge trigger is activated during high to low transition. Schmitt trigger input for timer/event counter 0 Schmitt trigger input for timer/event counter 1 Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option). Schmitt trigger reset input, active low Positive power supply OSC1 and OSC2 are connected to an RC network or a crystal (by mask option) for the internal system clock. In the case of RC operation, OSC2 is the output terminal for 1/4 system clock. Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option). Bidirectional 8-bit input/output ports Software instructions determine the CMOS output or schmitt trigger input (pull-high depends on mask option).
PA0~PA7
I/O
PB0~PB7 VSS INT TMR0 TMR1 PC0~PC7 RES VDD OSC1 OSC2
I/O -- I I I I/O I -- I O
PD0~PD7
I/O
PE0~PE7
I/O
PF0~PF7
I/O
PG0~PG7
I/O
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Absolute Maximum Ratings
Supply Voltage ....................... VDD-0.3V to 5.5V Input Voltage .................VSS-0.3V to VDD+0.3V Storage Temperature................. -50C to 125C Operating Temperature .............. -25C to 70C
Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.
D.C. Characteristics
Symbol
VDD IDD1
Ta=25C
Parameter
Operating Voltage Operating Current (HT48C10 Crystal OSC) Operating Current (HT48C10 RC OSC) Operating Current (HT48C30 Crystal OSC) Operating Current (HT48C30 RC OSC) Operating Current (HT48C50 Crystal OSC) Operating Current (HT48C50 RC OSC) Operating Current (HT48C70 Crystal OSC) Operating Current (HT48C70 RC OSC) Standby Current (WDT Enabled) Standby Current (WDT Disabled)
Test Conditions VDD
-- 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V
Min.
2.4 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Typ.
-- 0.7 2 0.5 1 0.7 2 0.5 1 1 2.5 0.75 1.5 1.5 3.4 1 2.1 -- -- -- --
Max.
5.2 1.5 3 1 2 1.5 3 1 2 2 5 1.5 3 3 6 2 4 5 10 1 2
Unit
V mA
Conditions
-- No load fSYS=4MHz No load fSYS=2MHz No load fSYS=4MHz No load fSYS=2MHz No load fSYS=4MHz No load fSYS=2MHz No load fSYS=4MHz No load fSYS=2MHz No load system halt No load system halt
IDD2
mA
IDD3
mA
IDD4
mA
IDD5
mA
IDD6
mA
IDD7
mA
IDD8
mA
ISTB1
A
ISTB2
A
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Test Conditions VDD
VIL Input Low Voltage for I/O ports Input High Voltage for I/O Ports Input Low Voltage (TMR, TMR0, TMR1, INT) Input High Voltage (TMR, TMR0, TMR1, INT) Input Low Voltage (RES) 3V 5V 3V 5V 3V 5V 3V 5V 3V 5V Input High Voltage (RES) 3V 5V I/O Ports Sink Current 3V 5V I/O Ports Source Current Pull-high Resistance of I/O Ports and INT 3V 5V 3V 5V
Symbol
Parameter
Min.
0 0 2.1 3.5 0 0 2.3 3.8 -- -- -- -- 1.5 4 -1 -2 40 10
Typ.
-- -- -- -- -- -- -- -- 1.5 2.5 2.4 4.0 4 10 -2 -4.5 60 30
Max.
0.9 1.5 3 5 0.7 1.3 3 5 -- -- -- -- -- -- -- -- 80 50
Unit
Conditions
-- -- -- -- -- -- -- -- -- -- -- -- VOL=0.3V VOL=0.5V VOH=2.7V VOH=4.5V -- -- V
VIH
V
VIL1
V
VIH1
V
VIL2
V
VIH2
V
IOL
mA
IOH
mA
RPH
k
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A.C. Characteristics
Symbol Parameter Test Conditions VDD
fSYS1 System Clock (Crystal OSC) 3V 5V System Clock (RC OSC) Timer I/P Frequency (TMR, TMR0, TMR1) Watchdog Oscillator Watchdog Time-out Period (RC) Watchdog Time-out Period (System Clock) External Reset Low Pulse Width System Start-up Timer Period Interrupt Pulse Width 3V 5V 3V 5V -- Ta=25C
Min.
400 400 400 400 0 0 45 35
Typ.
-- -- -- -- -- -- 90 65 23 17 1024 --
Max.
4000 8000 2000 3000 4000 4000 180 130 45 35 -- --
Unit
kHz kHz kHz kHz kHz kHz
s
Conditions
-- -- -- -- -- -- -- Without WDT prescaler Without WDT prescaler -- Power-up or Wake-up from halt --
fSYS2
fTIMER
tWDTOSC
tWDT1 tWDT2 tRES
-- -- --
12 9 -- 1
ms tSYS
s
tSST tINT
-- --
-- 1
1024 --
-- --
tSYS
s
Note: tSYS=1/fSYS
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Functional Description
The four microcontrollers of the HT48C10/ HT48C30/HT48C50/HT48C70 are constructed using basically the same principles. Their differences lie in variations in sizes such as ROM and RAM as well as bit number, counter number, I/O line number, and different level subroutine nesting bit number. The following is a more detailed description of the system architectures of the four microcontrollers. Unless specified, the architecture stated below exists in these four microcontrollers.
Execution flow
trols a sequence in which the instructions stored in the program ROM are executed. The contents of the PC can specify 1024, 2048, 4096, or 8192 addresses at maximum, according to the microcontroller (HT48C10/HT48C30/ HT48C50/HT48C70) chosen. After accessing a program memory word in order to fetch an instruction code, the contents of the PC is incremented by one. The PC then points to the memory word consisting of the next instruction code. When executing a jump instruction, conditional skip execution, loading a PCL register, a subroutine call, an initial reset, an internal interrupt, an external interrupt, or returning from a subroutine, the PC manipulates a program transfer by loading the address corresponding to each instruction. The conditional skip is activated by instructions. Once the condition is met, the next instruction, fetched during the current instruction execution, is discarded and a dummy cycle replaces it to get a proper instruction; otherwise it proceeds to the next instruction. The lower byte of the PC (PCL) is a readable and writeable register (06H). Moving data into the PCL performs a short jump. The destination is within 256 locations. For a control transfer to take place, an additional dummy cycle is required.
The system clock is derived from either a crystal or an RC oscillator. It is internally divided into four non-overlapping clocks. Each instruction cycle consists of four system clock cycles. Instruction fetching and execution are pipelined in such a way that a fetch takes one instruction cycle while decoding and execution takes the next instruction cycle. The pipelining scheme causes each instruction to effectively execute in a cycle. If an instruction changes the program counter, two cycles are required to complete the instruction.
Program counter - PC
The program counter (PC) is of different sizes ranging from 10 bits to 13 bits according to the microcontroller selected (10 bits for the HT48C10; 11 bits for the HT48C30; 12 bits for the HT48C50; 13 bits for the HT48C70). It con-
Execution flow
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Program memory - ROM
The program memory (ROM) is used to store the program instructions that are to be executed. It contains data, table, and interrupt entries, and is organized into 1024x14 bits, 2048x14 bits, 4096x15 bits, or 8192x16 bits according to the microcontroller (HT48C10/ HT48C30/HT48C50/ HT48C70) selected. These bits are all addressed by the PC and table pointer. Certain locations in the ROM stated below are reserved for special usage in the four microcontrollers except location 00CH which is used for the HT48C50/HT48C70 exclusively.
* Location 000H
Location 000H is reserved for program initialization. After chip reset, the program always begins execution at this area.
* Location 004H
Location 004H is reserved for external interrupt service program. If the INT input pin is activated, the interrupt is enabled, and the stack is not full, the program begins execution at location 004H.
* Location 008H
Program memory HT48C50/HT48C70. If the timer interrupt results from a timer/event counter overflow of the HT48C10/HT48C30 or a timer/event counter 0 overflow of the HT48C50/HT48C70, and the interrupt is enabled, and the stack is not full, the program begins execution at location 008H.
Location 008H is reserved for the timer/event counter interrupt service program of the HT48C10/HT48C30 and for the timer/event counter 0 interrupt service program of the
Mode
Initial reset External interrupt Timer/event counter 0 overflow Timer/event counter 1 overflow Skip Loading PCL Jump, call branch Return from subroutine Notes: m=10 for the HT48C10 m=11 for the HT48C30 m=12 for the HT48C50 m=13 for the HT48C70 0000H 0004H 0008H 000CH PC+2
Contents of Program Counter (m bits)
Low byte replaced by instruction code Instruction code Stack register
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* Location 00CH
Location 00CH is reserved for the timer/ event counter 1 interrupt service program of the HT48C50/HT48C70 only. If the timer interrupt results from a timer/event counter 1 overflow, the interrupt is enabled, and the stack is not full, the program begins execution at location 00CH.
* Table location
to both the main routine and the ISR cannot be avoided, interrupts should be disabled prior to the table read instruction, and they should not be enabled until the TBLH is backed-up. All the table related instructions require 2 cycles to complete an operation. These areas may function as a normal program memory depending upon the user's requirements.
Stack register - STACK
Any location in the ROM can be used as a look-up table. The instructions TABRDC [m] (the current page, 1 page=256 words) and TABRDL [m] (the last page) transfer the contents of the lower-order byte to the specified data memory, and the higher-order byte to TBLH (08H). Only the destination of the lower-order byte in the table is well-defined, and the higher-order byte of the table word is transferred to the Table Higher-order byte register (TBLH). The TBLH is read only. The Table Pointer (TBLP), on the other hand, is a read/write register (07H) used to indicate the table location. Before accessing the table, the location should be placed in the TBLP. The TBLH is read only and cannot be restored. If the main routine and the ISR (Interrupt Service Routine) both employ the table read instruction, the contents of the TBLH in the main routine is likely to be changed by the table read instruction used in the ISR. Errors will then occur. Hence, simultaneously using the table read instruction in the main routine and the ISR should be avoided. Nonetheless, if the application of the table read instruction
The stack register is a special memory port used to save the contents of the PC. The stack can be organized into 2, 4, or 8 levels according to the microcontroller selected (2 levels for the HT48C10/HT48C30, 4 levels for the HT48C50, 8 levels for the HT48C70). The register is neither part of the data nor part of the program, and is neither readable nor writeable. Any activated level is indexed by a stack pointer (SP) and is neither readable nor writeable. At a subroutine call or interrupt acknowledgment, the contents of the PC is pushed onto the stack. At the end of a subroutine or an interrupt routine, signaled by a return instruction (RET or RETI), the contents of the PC is restored to its previous value from the stack. After chip reset, the SP will point to the top of the stack. If the stack is full and a non-masked interrupt takes place, the interrupt request flag is recorded but the acknowledgment is still inhibited. After the stack pointer is decremented (by RET or RETI), the interrupt will be serviced. This feature prevents the occurrence of stack overflow, allow-
Instruction(s) *m~*8
TABRDC [m] TABRDL [m] Pm~P8 1~1
Table Location
7 6 5 4 3 2 1 0
@7 @7
@6 @6
@5 @5
@4 @4
@3 @3
@2 @2
@1 @1
@0 @0
Table location Notes: m~0: Bits of table location @7~@0: Bits of table pointer Pm~P8: Bits of current Program Counter m=9 for the HT48C10 m=10 for the HT48C30 m=11 for the HT48C50 m=12 for the HT48C70
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ing the programmer to use the structure easily. Likewise, if the stack is full and a CALL is subsequently executed, a stack overflow will occur and the first entry will be lost (only the most recent four return addresses will be stored).
Data memory - RAM
The data memory (RAM) is composed of bits ranging from 81x8, 113x8, 184x8, or 255x8, depending on the microcontroller chosen (HT48C10/ HT48C30/HT48C50/HT48C70). It is divided into two functional groups, i.e., special function registers and general purpose data memory (of 64x8, 96x8, 160x8, or 224x8 bits, depending on the microcontroller selected (HT48C10/ HT48C30/HT48C50/HT48C70). Most components of the two functional groups are readable/writable, but some are read-only. Of the two functional groups, the special function registers of the four microcontrollers consist of a program counter lower-order byte register (PCL;06H), an accumulator (ACC; 05H), a table pointer (TBLP;07H), a table higher-order byte register (TBLH;08H), a status register (STATUS;0AH), an interrupt control register (INTC;0BH), a watchdog timer option setting register (WDTS;09H), an indirect addressing register (00H), a memory pointer register (MP;01H), a timer/event counter (TMR;0DH), a timer/event counter control register (TMRC;0EH), I/O registers (PA;12H,PB;14H, PC;16H), and I/O control registers (PAC;13H,PBC;15H,PCC;17H). But of the HT48C50/HT48C70, the following components are further divided into two or several sub-components. First, the indirect addressing register is divided into two registers involving indirect addressing register 0 (00H) and indirect addressing register 1 (02H). Second, the memory pointer register is also comprised by two registers involving memory pointer register 0 (MP0;01H) and memory pointer register 1 (MP1;03H). Third, the timer/event counter register is organized by two registers according to different orders of byte, namely timer/event higher-order byte register and timer/event lower-order byte register, both of which are further divided into timer/event counter 0 higher16
RAM mapping order byte register (TMR0H; 0CH), timer/ event counter 1 higher-order byte register (TMR1H;0FH), timer/event counter 0 lower-order byte register (TMR0L;0DH), and timer/event counter 1 lower-order byte register (TMR1L;10H). Fourth, the timer/event counter control register is divided into two registers involving timer/event counter 0 control register
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(TMR0C;0EH) and timer/event counter 1 control register (TMR1C;11H). Fifth, the entire number of I/O registers is expanded from 3 to 6 (PA;12H,PB;14H,PC;16H,PD;18H,PE;1AH, PF;1CH,PG; 1EH). Finally, the number of I/O control registers is also doubled (PAC;13H, P B C ; 1 5 H , P C C ; 1 7 H , P D C ; 1 9 H , P E C ; 1 B H, PFC;1DH,PGC;1FH). The remaining space before the 20H of the four microcontrollers are all reserved for future expansion usage. Reading these remaining locations will return the result to 00H. The general purpose data memory, addressed from 40H~7FH of the HT48C10, 20H~7FH of the HT48C30, 60H~FFH of the HT48C50, or 20H~FFH of the HT48C70 according to the microcontroller selected, is used for data and control information under instruction commands. All the RAM areas can directly execute arithmetic, logic, increment, decrement, and rotate operations. Except some dedicated bits, each bit in the RAM can be set and reset by the SET [m].i and CLR [m].i instructions, respectively. These RAM areas are indirectly accessible through the memory pointer register(s) MP (01H) of the HT48C10/HT48C30 or MP0 (01H) and MP1 (03H) of the HT48C50/HT48C70.
Indirect addressing register
by combining the corresponding indirect addressing registers. The bit 7 of MP (HT48C10/HT48C30) is undefined and reading will return the result "1". Any writing operation to MP will only transfer the lower 7-bit data to MP.
Accumulator ACC
The accumulator (ACC) relates to the ALU operations. It is also mapped to location 05H of the RAM and is capable of operating with immediate data. The data movement between two data memories will pass through the ACC.
Arithmetic and logic unit - ALU
This circuit performs 8-bit arithmetic and logic operations. It provides the following functions:
* Arithmetic operations (ADD, ADC, SUB,
SBC, DAA)
* Logic operations (AND, OR, XOR, CPL) * Rotation (RL, RR, RLC, RRC) * Increment and Decrement (INC, DEC) * Branch decision (SZ, SNZ, SIZ, SDZ, etc.)
The ALU saves the results of the data operation and change the status register as well.
Status register - STATUS
Of the four microcontrollers, the HT48C10/ HT48C30 make use of location 00H whereas the HT48C50/HT48C70 of locations 00H and 02H as indirect addressing registers that are not physically implemented. Any read/write operation of [00H] or of [00H] and [02H] accesses the RAM pointed to by MP (01H) or by MP0 (01H) and MP1 (03H) respectively according to the microcontroller chosen. Reading location 00H or 02H indirectly will return the result 00H. Writing it indirectly will, result to no operation. The function of data movement between two indirect addressing registers is not supported. The memory pointer register MP of the HT48C10/HT48C30 or MP0 and MP1 of the HT48C50/HT48C70 are of 7 bits or 8 bits wide respectively, and can be used to access the RAM
The status register (0AH) is of 8 bits wide and consists of a zero flag (Z), a carry flag (C), an auxiliary carry flag (AC), an overflow flag (OV), a power down flag (PD), and a watchdog timeout flag (TO). The register also records the status information and controls the operation sequence. Except the TO and PD flags, bits in the status register can all be altered by instructions, similar to the case with other registers. Any data written into the status register will not change the TO or PD flags. But the operations related to the status register may lead to different results from those intended. The TO and PD flags can be changed by system power up, Watchdog Timer overflow, executing the HALT instruction, or clearing the Watchdog Timer. The Z, OV, AC, and C flags all reflect the status of the latest operations.
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On entering the interrupt sequence or executing the subroutine call, the status register will not be automatically pushed onto the stack . If the contents of the status is important and the subroutine can corrupt the status register, the programmer should take precautions to save it properly.
Interrupt
if the related interrupt is enabled, until the SP is decremented. If immediate servicing is desired, the stack should be prevented from becoming full. All these interrupts have a wake-up capability. As an interrupt is serviced, a control transfer occurs by pushing the PC onto the stack and then by branching it to subroutines at the specified location(s) in the ROM. Only the contents of the PC can be pushed onto the stack. If the contents of the register and of the status register (STATUS) are altered by the interrupt service program which corrupts the desired control sequence, the programmer should save these contents first. The external interrupt is triggered by a high to low transition of the INT, and the related interrupt request flag (EIF; bit 4 of INTC) is then set. When the interrupt is enabled, the stack is not full, and the external interrupt is active, a subroutine call to location 04H will occur. The interrupt request flag (EIF) and EMI bits will also be cleared to disable other interrupts. Of the four microcontrollers, the internal timer/event counter interrupt of the HT48C10/ HT48C30 is initialized by setting the timer/
The four microcontrollers all provide an external interrupt and internal timer/event counter interrupts. The interrupt control register (INTC;0BH) contains interrupt control bits for setting the enable/disable mode and the interrupt request flags. Once an interrupt subroutine is serviced, the remaining interrupts will all be blocked (by clearing the EMI bit). This scheme may prevent any further interrupt nesting. Other interrupt requests may happen during this interval but only the interrupt request flag will be recorded. If a certain interrupt requires servicing within the service routine, the programmer may set the EMI bit and the corresponding bit of INTC so as to allow interrupt nesting. If the stack is full, the interrupt request will not be acknowledged, even
Labels
C
Bits
0
Function
C is set if the operation results in a carry during an addition operation or if a borrow does not take place during a subtraction operation; otherwise C is cleared. Also it is affected by a rotate through carry instruction. AC is set if the operation results in a carry out of the low nibbles in addition or no borrow from the high nibble into the low nibble in subtraction; otherwise AC is cleared. Z is set if the result of an arithmetic or logic operation is zero; otherwise Z is cleared. OV is set if the operation results in a carry into the highest-order bit but not a carry out of the highest-order bit, or vice versa; otherwise OV is cleared. PD is cleared by either a system power-up or executing the CLR WDT instruction. PD is set by executing the HALT instruction. TO is cleared by a system power-up or executing the CLR WDT or HALT instruction. TO is set by a WDT time-out. Undefined, read as 0 Undefined, read as 0 Status register
AC
1
Z OV PD TO -- --
2 3 4 5 6 7
18
25th May '99
HT48CXX/HT48RXX
event counter interrupt request flag (TF; bit 5 of INTC), that is caused by a timer overflow. When the interrupt is enabled, and the stack is not full, and the TF bit is set, a subroutine call to location 08H will occur. The related interrupt request flag (TF) will be reset and the EMI bit will be cleared to disable further interrupts. The internal timer/event counter of the HT48C50/HT48C70, is composed of two interrupts, namely internal timer/event counter 0 interrupt and timer/event counter 1 interrupt. The internal timer/event counter 0 interrupt is initialized by setting the timer/event counter 0 interrupt request flag (T0F; bit 5 of INTC) which is caused by a timer/event counter 0 overflow. After the interrupt is enabled, the stack is not full, and the T0F bit is set, a subroutine call to location 08H will occur. The related interrupt request flag (T0F) will be reset and the EMI bit be cleared to disable further interrupts. On the other hand, the timer/event counter 1 interrupt is operated in the same manner as the timer/ event counter 0. The related interrupt control bits ET1I and T1F of the timer/event counter 1 are bit 3 and bit 6 of the INTC, respectively. During the execution of an interrupt subroutine of the four microcontrollers, other interrupt acknowledgments are all held until the RETI instruction is executed or the EMI bit and the related interrupt control bit are both set to 1 (when the stack is not full). To return from the interrupt subroutine, the RET or RETI instruction may be invoked. The RETI will set the EMI bit in order to enable an interrupt service whereas the RET will not. Interrupts that occur in an interval between the rising edges of two consecutive T2 pulses are serviced on the latter of the two T2 pulses if the corresponding interrupts are enabled. In case of simultaneous requests, the following table shows the priority that is applied. These can be masked by resetting the EMI bit.
No. Interrupt Source Priority Vector
a b *c External interrupt Timer/event counter 0 overflow Timer/event counter 1 overflow 1 2 3 04H 08H 0CH
* Note: c applies only to the HT48C50/ HT48C70
Register
Bit No.
0 1 2
Label
EMI EEI ET0I ET1I EIF T0F T1F --
Function
Control the master (global) interrupt (1= enabled; 0= disabled) Control the external interrupt (1= enabled; 0= disabled) Control the timer/event counter 0 interrupt (1= enabled; 0= disabled) Control the timer/event counter 1 interrupt (for the HT48C50/HT48C70 only) (1= enabled; 0= disabled) External interrupt request flag (1= active; 0= inactive) Internal timer/event counter 0 request flag (1= active; 0= inactive) Internal timer/event counter 1 request flag (for the HT48C50/HT48C70 only) (1= active; 0= inactive) Unused bit, read as "0" INTC register
19 25th May '99
INTC (0BH)
3 4 5 6 7
HT48CXX/HT48RXX
The timer/event counter interrupt request flag (TF), external interrupt request flag (EIF), enable timer/event counter bit (ETI), enable external interrupt bit (EEI), and enable master interrupt bit (EMI) constitute an interrupt control register (INTC) of the HT48C10/HT48C30 which is located at 0BH in the RAM. On the other hand, the timer/event counter 0/1 interrupt request flag (T0F/T1F), external interrupt request flag (EIF), enable timer/event counter 0/1 bit (ET0I/ET1I), enable external interrupt bit (EEI), and enable master interrupt bit (EMI) make up the interrupt control register (INTC) of the HT48C50/HT48C70 which is located at 0BH in the RAM. EMI, EEI, and ETI, of the HT48C10/HT48C30 or EMI, EEI, ET0I, and ET1I of the HT48C50/HT48C70 are all used to control the enable/disable status of interrupts. These bits prevent the requested interrupt from being serviced. Once the interrupt request flags (TF, EIF of the HT48C10/HT48C30 or T0F, T1F, EIF of the HT48C50/HT48C70) are set, they will remain in the INTC register until the interrupts are all serviced or cleared by a software instruction. It is suggested that a program should not employ the "CALL subroutine" within the interrupt subroutine, since its operation within the interrupt subroutine may damage the original control sequence, and interrupts often occur in an unpredictable manner or it may need immediate servicing for certain applications. Given this, if only one stack is left and enabling the interrupt is not well controlled, the original control sequence may be ruined as a result of operating the CALL subroutine in the interrupt subroutine.
Oscillator configuration
System oscillator VDD is required and its resistance ranges from 51k to 1M. The system clock, divided by 4, is available on OSC2 (NMOS open drain output), which can be used to synchronize external logic. The RC oscillator provides the most cost effective solution. However, the frequency of the oscillation may vary with VDD, temperature and the chip itself due to process variations. It is, therefore, not suitable for timing sensitive operations where accurate oscillator frequency is desired. On the other hand, if the crystal oscillator is used, a crystal across OSC1 and OSC2 is needed to provide the feedback and phase shift required for the crystal oscillator. No other external components are required. Instead of a crystal, the resonator can also be connected between OSC1 and OSC2 to derive a frequency reference, but two external capacitors in OSC1 and OSC2 are required. The WDT oscillator is a free running on-chip RC oscillator, and no external components are required. Even if the system enters the power down mode, the system clock is stopped but the WDT oscillator still works with a period of approximately 78 s. The WDT oscillator can be disabled by mask option to conserve power.
Watchdog timer - WDT
There are 2 oscillator circuits available, namely RC oscillator and crystal oscillator, decided by mask options. Both are designed for system clocks. No matter what type of oscillator is chosen, the signal supports the system clock. The HALT mode stops the system oscillator and ignores any external signals so as to conserve power. Of the two oscillator types, if an RC oscillator is used, an external resistor between OSC1 and
The clock source of the WDT is implemented by a dedicated RC oscillator (WDT oscillator) or an instruction clock (system clock divided by 4), decided by mask options. The WDT is designed to prevent a software malfunction or sequence from jumping to an unknown location with unpredictable results. The WDT can be disabled by mask option. If the WDT is disabled, all the executions related to the WDT may lead to no operation.
20 25th May '99
HT48CXX/HT48RXX
Watchdog timer If the internal WDT oscillator (RC oscillator with a period of 78s normally) is selected, it is first divided by 256 (8 stages) to derive a nominal time-out period of about 20ms. This timeout period may vary with temperature, VDD, and process variations. By invoking the WDT prescaler, longer time-out periods can be realized. Writing data to WS2, WS1, and WS0 (bit 2,1,0 of the WDTS) can lead to different timeout periods. If the values of WS2, WS1, and WS0 all equal to 1, the division ratio is up to 1:128, and the maximum time-out period is 2.6 seconds. But if the WDT oscillator is disabled, the WDT clock may still come from the instruction clock and operate in the same manner except that in the HALT state the WDT may stop counting and lose its protecting purpose. In this situation the logic can be restarted by external logic. The high nibble and bit 3 of the WDTS are reserved for user defined flags, and the programmer may use these flags to indicate some specified status. strongly recommended, since the HALT will terminate the system clock. The overflow of WDT under normal operation can initialize "chip reset" and set the status bit TO. But in the HALT mode, the overflow will initialize a "warm reset", and only the PC and SP are reset to zero. To clear the contents of WDT (the WDT prescaler included), three methods can be adopted, i.e., external reset (a low level to RES), software instruction(s), and a HALT instruction. The software instruction(s) consists of CLR WDT and the other set -- CLR WDT1 and CLR WDT2. Of these two types of instructions, only one type can be active depending on mask option -- "CLR WDT times selection option". If the "CLR WDT" is chosen (i.e., CLRWDT times equal one), any execution of the CLR WDT instruction will clear the WDT. In the case that the "CLR WDT1" and "CLR WDT2" are chosen (i.e., CLRWDT times equal two), these two instructions should be executed to clear the WDT; otherwise, the WDT may reset the chip due to time-out.
Power down operation - HALT
WS2
0 0 0 0 1 1 1 1
WS1
0 0 1 1 0 0 1 1
WS0
0 1 0 1 0 1 0 1
Division Ratio
1:1 1:2 1:4 1:8 1:16 1:32 1:64 1:128
The HALT mode is initialized by the HALT instruction and results in the following.
* The system oscillator turns off but the WDT
* *
WDTS Register If the device operates in a noisy environment, using the on-chip RC oscillator (WDT OSC) is
21
* *
oscillator keeps running (if the WDT oscillator is selected). The contents of the on-chip RAM and registers remain unchanged. The WDT and WDT prescaler are cleared and recount (if the WDT clock comes from the WDT oscillator). All I/O ports maintain their original status. The PD flag is set and the TO flag is cleared.
The system can quit the HALT mode by exter-
25th May '99
HT48CXX/HT48RXX
nal reset, interrupt, external falling edge signal on port A, or a WDT overflow. An external reset may cause device initialization, and the WDT overflow performs a "warm reset". Examining the TO and PD flags, the reason for chip reset is determined. The PD flag is cleared by system power-up or executing the CLR WDT instruction, and is set by executing the HALT instruction. The TO flag is set if the WDT time-out occurs, and causes a wake-up that resets the PC and SP only. The others maintain their original status. The port A wake-up and interrupt methods can be considered as a continuation of normal execution. Each bit in port A can be independently selected to wake up the device by mask option. Awakening from an I/O port stimulus, the program will resume execution of the next instruction. On the other hand, awakening from an interrupt, two sequences may happen. If the related interrupt(s) is disabled or the interrupt(s) is enabled but the stack is full, the program will resume execution at the next instruction. But if the interrupt is enabled and the stack is not full, the regular interrupt response takes place. When wake-up event(s) occurs, it takes 1024 tSYS (system clock period) to resume normal operation. That is to say, a dummy period is inserted after the wake-up. If the wake-up results from an interrupt acknowledgment, the actual interrupt subroutine execution will be delayed by more than one cycle. But if the wakeup results in the next instruction execution, the instruction will execute immediately after the dummy period is finished. If an interrupt request flag is set to "1" before entering the HALT mode, the make-up function of the related interrupt will be disabled. To minimize power consumption, all the I/O pins should be carefully managed before entering the HALT status.
Reset
Reset timing chart
Reset circuit
Reset configuration WDT time-out during the HALT is different from other chip reset conditions, for it can perform a "warm reset" that resets only PC and SP and leaves the other circuits at their original state. Some registers remain unchanged during any other reset conditions. Most of the registers are reset to the "initial condition" when the reset conditions are met. By examining the PD flag and TO flag, the program distinguishes between different "chip resets".
TO
0 u 0
PD
0 u 1
RESET Conditions
RES reset during power-up RES reset during normal operation RES wake-up HALT
There are three ways in which reset may occur:
* RES is reset during normal operation * RES is reset during HALT * WDT timeout is reset during normal operation
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HT48CXX/HT48RXX
TO
1 1
PD
u 1
RESET Conditions
WDT time-out during normal operation WDT wake-up HALT
Timer/event counter
Note: "u" means "unchanged" To guarantee that the system oscillator is started and stabilized, the SST (System Startup Timer) provides an extra-delay. The extradelay delays 1024 system clock pulses when the system powers up or awakes from the HALT state. When the system power-up occurs, the SST delay is added during the reset period. But when the reset comes from the RES pin, the SST delay is disabled. Any wake-up from HALT will enable the SST delay. The status of the chip reset of the functional units are as shown. PC Interrupt Prescaler WDT Timer/event counter (0/1) Input/output ports SP 000H Disabled Cleared Cleared After a master reset, WDT begins counting. Off Input mode Point to the top of the stack
There are two timer/event counters implemented in the four microcontrollers. Of the four microcontrollers, the timer/event counter of the HT48C10/HT48C30 contains an 8-bit programmable count-up counter. On the other hand, the timer/event counter of the HT48C50/HT48C70 composes of two counters, namely timer/event counter 0 and timer/event counter 1. The timer/event counter 0 contains a 16-bit programmable counter, and the timer/event counter 1 contains an 8-bit programmable count-up counter of the HT48C50. The timer/event counters 0 and 1 of the HT48C70 both contain a 16-bit programmable count-up counter. The source of the clock of the four microcontrollers may come from an external source or the system clock divided by 4. If the internal instruction clock is applied, only one reference time-base is available. The external clock input, on the other hand, allows the user to count external events, measure time intervals or pulse width, or generate an accurate time base. Of the HT48C10/HT48C30, there are two registers related to the timer/event counter, i.e., TMR ([0DH]) and TMRC ([0EH]). There are two physical registers mapped to the TMR location. Writing TMR puts the starting value in the timer/event counter preload register while reading TMR gets the contents of the timer/ event counter. The TMRC, on the other hand, is a timer/event counter control register.
Timer/event counter 0/1
23 25th May '99
HT48CXX/HT48RXX
The states of the special function registers are summarized in the following table:
Register
TMR1H TMR1L TMR1C TMR0H TMR0L TMR0C PC MP0 MP1 ACC TBLP TBLH STATUS INTC WDTS PA PAC PB PBC PC PCC PD PDC PE PEC PF PFC PG PGC Note:
Reset (power on)
xxxx xxxx xxxx xxxx 00-0 1--xxxx xxxx xxxx xxxx 00-0 1--000H xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx --00 xxxx -000 0000 0000 0111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111
WDT time-out (normal operation)
uuuu uuuu uuuu uuuu 00-0 1--uuuu uuuu uuuu uuuu 00-0 1--000H uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --1u uuuu -000 0000 0000 0111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111
RES reset (normal operation)
uuuu uuuu uuuu uuuu 00-0 1--uuuu uuuu uuuu uuuu 00-0 1--000H uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --uu uuuu -000 0000 0000 0111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111
RES reset (HALT)
uuuu uuuu uuuu uuuu 00-0 1--uuuu uuuu uuuu uuuu 00-0 1--000H uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --01 uuuu -000 0000 0000 0111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111
WDT time-out* (HALT)
uuuu uuuu uuuu uuuu uu-u u--uuuu uuuu uuuu uuuu uu-u u--000H uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu --11 uuuu -uuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu uuuu
"" means "warm reset" "u" means "unchanged" "x" means "unknown" "-" means "undefined" The bits of the special function registers are denoted as "-" if they are not defined in the microcontrollers.
24 25th May '99
HT48CXX/HT48RXX
Of the HT48C50/HT48C70, the timer/event counter is comprised by two counters, i.e., timer/event counter 0 and timer/event counter 1. There are three registers related to the timer/event counter 0, namely TMR0H (0CH), TMR0L (0DH), and TMR0C (0EH). Writing TMR0L only writes the data into a low byte buffer, but writing TMR0H writes the data along with the contents of the low byte buffer into the timer/event counter 0 preload register (16-bit). The timer/event counter 0 preload register is changed by writing the TMR0H operations, and writing TMR0L keeps the timer/ event counter 0 preload register unaltered. Also, reading the TMR0H latches the TMR0L into the low byte buffer in order to avoid the false timing problem. Then, reading the TMR0L will return the contents of the low byte buffer. In other words, the low byte of the timer/event counter 0 cannot be read directly. Instead it has to read the TMR0H first in order to make the low byte contents of the timer/event counter 0 latched into the buffer. On the other hand, there are also three registers related to the timer/event counter 1, namely TMR1H (0FH), TMR1L (10H), and TMR1C (11H). The timer/ event counter 1 operates in the same manner as the timer/event counter 0. The TMR0C is a timer/event counter 0 control register defining the timer/event counter 0 options. The timer/event counter 1 has the same options as the timer/event counter 0 and is defined by TMR1C. The timer/event counter control registers of the four microcontrollers are all used to define the operation mode, counting enable or disable, and active edge. The TM0 and TM1 bits define the operation mode. The event count mode is used to count external events, which means that the clock source comes from an external pin TMR of the HT48C10/HT48C30 or TMR0/TMR1 of the HT48C50/HT48C70. The timer mode functions as a normal timer with the clock source coming from the instruction clock. The pulse width measurement mode can be used to count the high or low level duration of the external signal TMR of the HT48C10/HT48C30 or TMR0/TMR 1 of the HT48C50/HT48C70. The counting is based on the instruction clock. In the event count or timer mode, once the timer/event counter starts counting, it will count from the current contents in the timer/event counter to FFH of the HT48C10/HT48C30/ HT48C50 (TMR1) or to FFFFH of the HT48C50 (TMR0)/HT48C70. If an overflow occurs, the counter is reloaded from the timer/ event counter preload register and generates the corresponding interrupt request flag TF (bit 5 of INTC) of the HT48C10/HT48C30 or T0F/T1F (bit 5/6 of INTC) of the HT48C50/ HT48C70 at the same time.
Label
-- TE TON --
Bits
0~2 3 4 5 Unused bits, read as "0"
Function
To define TMR0/TMR1 active edge of the timer/event counter (0= active on low to high; 1= active on high to low) To enable/disable timer counting (0= disabled; 1= enabled) Unused bits, read as "0" To define the operating mode 01= Event count mode (external clock) 10= Timer mode (internal clock) 11= Pulse width measurement mode 00= Unused TMR0C/TMR1C register
TM0 TM1
6 7
25
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HT48CXX/HT48RXX
In the pulse width measurement mode with the values of the TON and TE bits equal to one, if the TMR0/ TMR1 has received a transient from low to high (or high to low; if the TE bit is 0) it will start counting until the TMR of the HT48C10/HT48C30 or TMR0/TMR1 of the HT48C50/ HT48C70 returns to the original level and resets the TON. The measured result remains in the timer/event counter even if the activated transient happens again. In other words, only one cycle measurement can be done. Until setting the TON, the cycle measurement will re-function as long as it receives further transient pulse. In this operation mode, the timer/event counter starts counting according not to the logic level but to the transient edges. In the case of counter overflows, the counter is reloaded from the timer/event counter preload register and issues an interrupt request just like the other two modes. To enable the counting operation, the timer ON bit (TON; bit 4 of TMRC of the HT48C10/ HT48C30 or bit 4 of TMR0C/TMR1C of the HT48C50/HT48C70) should be set to 1. In the pulse width measurement mode, the TON will be cleared automatically after the measurement cycle is complete. But in the other two modes the TON can only be reset by instructions. The overflow of the timer/event counter is one of the wake-up sources. No matter what the operation mode is, writing a 0 to ETI of the HT48C10/HT48C30 or to ET0I/ET1I of the HT48C50/HT48C70 can disable the corresponding interrupt service. In the case of timer/event counter OFF condition, writing data to the timer/event counter preload register also reloads that data to the timer/event counter. But if the timer/event counter is turned on, data written to the timer/event counter is reserved only in the timer/event counter preload register. The timer/event counter will go on operating until an overflow occurs. After the timer/event counter (reading TMR o f t h e H T 4 8 C 1 0 / HT 4 8 C 3 0 o r T M R 0 H/ TMR1H of the HT48C50/HT48C70) is read, the clock is blocked to avoid errors. As this may results in a counting error, blocking of the clock should be taken into account by the programmer.
Input/output ports
There are various numbers of bidirectional input/output lines in the four microcontrollers. The HT48C10 includes 18 bidirectional input/output lines, labeled from PA to PC, which are mapped to the [12H], [14H], or [16H] of the RAM, respectively. The HT48C30 contains 22 bidirectional input/output lines, labeled from PA to PC, which are mapped to [12H], [14H], or [16H], respectively. The HT48C50 consists of 32
Input/output ports
26
25th May '99
HT48CXX/HT48RXX
bidirectional input/output lines, labeled from PA to PD, which are mapped to the [12H], [14H], [16H], or 18H], respectively. Finally, the HT48C70 contains 56 bidirectional input/output lines, labeled from PA to PG, which are mapped to the RAM of [12H], [14H], [16H], [18H], [1AH], [1CH], and [1EH], respectively. Of the four microcontrollers, all of these I/O ports can be used for input and output operations. For the input operation, these ports are non-latching, i.e., the inputs should be ready at the T2 rising edge of the instruction MOV A,[m] (m=12H, 14H, 16H, 18H, 1AH, 1CH, or 1EH). For the output operation, all data are latched and remain unchanged until the output latch is rewritten. Each I/O line has its own control register (PAC, PBC, PCC, PDC, PEC, PFC, PGC (the fist three registers PAC, PBC, PCC are all used by the four microcontrollers; the register PDC is extraused by the HT48C50; all the seven registers are applied in the HT48C70) to control the input/ output configuration. With this control register, CMOS output or schmitt trigger input with or without pull-high resistor (by mask option) structures can be reconfigured dynamically (i.e., on-the-fly) under software control. To function as an input, the corresponding latch of the control register must be written with a "1". The pull-high resistance shows itself automatically if the pull-high option is selected. The input source(s) also depends on the control register. If the value of the control register bit is "1", the input will read the pad state. But if the value of the control register bit is "0", the contents of the latches will be moved to the internal bus. The latter is possible in "read-modifywrite" instruction. For the output function, CMOS is the only configuration. These control registers are mapped to locations 13H, 15H, 17H, 19H, 1BH, 1DH and 1FH (the first three locations 13H, 15H, 17H exist in the four microcontrollers; the location 19H is used for the HT48C50; all the 7 locations are applied in the HT48C70). After a chip reset, these input/output lines stay at the high level or floating (by mask option). Each bit of these input/output latches can be set or cleared by the SET [m].i or CLR [m].i (m=12H,
27 25th May '99
14H, 16H, 18H, 1AH, 1CH or 1EH (the first three options, namely 12H, 14H, and 16H, exist in the four microcontrollers; the HT48C50 is provided with an extra option of 18H; these seven options all exist in the HT48C70) instruction. Some instructions first input data and then follow the output operations. For example, the SET [m].i, CLR [m].i, CPL [m] and CPLA [m] instructions read the entire port states into the CPU, execute the defined operations (bit-operation), and then write the results back to the latches or the accumulator. Each line of port A has the capability to wake-up the device.
Mask option
The following table illustrates the five kinds of mask option provided. All these options have to be defined to ensure proper system functioning.
No.
Mask Option
OSC type selection. This option is to decide if an RC or Crystal oscillator is chosen as system clock. If the Crystal oscillator is selected, the XST (Crystal Start-up Timer) default is activated; otherwise the XST is disabled. WDT source selection. There are three types of selection: on-chip RC oscillator, instruction clock or disable the WDT. CLRWDT times selection. This option defines the way of clearing the WDT by instruction. "Once" means that the CLR WDT instruction can clear the WDT. "Twice" means only if both of the CLR WDT1 and CLR WDT2 instructions have been executed, the WDT can be cleared. Wake-up selection. This option defines the activity of the wake-up function. External I/O pins (PA only) all have the capability to wake-up the chip from a HALT.
1
2
3
4
HT48CXX/HT48RXX
Application Circuits of HT48C70
fSYS(kHz)
8000 6000 4000 3580 2000 1000 640 480 455 400
C1
0 0 0 0 0 0 300pF 300pF 300pF 300pF
C2
0 0 0 0 0 0 300pF 300pF 300pF 300pF
Crystal
OK OK OK OK OK OK -- -- -- --
Ceramic resonator
OK OK OK OK OK -- OK OK OK OK
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HT48CXX/HT48RXX
Instruction Set Summary
Mnemonic
Arithmetic ADD A,[m] ADDM A,[m] ADD A,x ADC A,[m] ADCM A,[m] SUB A,x SUB A,[m] SUBM A,[m] SBC A,[m] SBCM A,[m] DAA [m] Logic Operation AND A,[m] OR A,[m] XOR A,[m] ANDM A,[m] ORM A,[m] XORM A,[m] AND A,x OR A,x XOR A,x CPL [m] CPLA [m] Increment & Decrement INCA [m] INC [m] DECA [m] DEC [m] Increment data memory with result in ACC Increment data memory Decrement data memory with result in ACC Decrement data memory Z Z Z Z 1 1(1) 1 1(1) AND data memory to ACC OR data memory to ACC Exclusive-OR data memory to ACC AND ACC to data memory OR ACC to data memory Exclusive-OR ACC to data memory AND immediate data to ACC OR immediate data to ACC Exclusive-OR immediate data to ACC Complement data memory Complement data memory with result in ACC Z Z Z Z Z Z Z Z Z Z Z 1 1 1 1(1) 1(1) 1(1) 1 1 1 1(1) 1 Add data memory to ACC Add ACC to data memory Add immediate data to ACC Add data memory to ACC with carry Add ACC to register with carry Subtract immediate data from ACC Subtract data memory from ACC Subtract data memory from ACC with result in data memory Subtract data memory from ACC with carry Subtract data memory from ACC with carry with result in data memory Decimal adjust ACC for addition with result in data memory Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV Z,C,AC,OV C 1 1(1) 1 1 1(1) 1 1 1(1) 1 1(1) 1(1)
Description
Flag Affected
Instruction Cycle
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HT48CXX/HT48RXX
Instruction Cycle
Mnemonic
Rotate RRA [m] RR [m] RRCA [m] RRC [m] RLA [m] RL [m] RLCA [m] RLC [m] Data Move MOV A,[m] MOV [m],A MOV A,x Bit Operation CLR [m].i SET [m].i Branch JMP addr SZ [m] SZA [m] SZ [m].i SNZ [m].i SIZ [m] SDZ [m] SIZA [m] SDZA [m] CALL addr RET RET A,x RETI Table Read TABRDC [m] TABRDL [m]
Description
Flag Affected
Rotate data memory right with result in ACC Rotate data memory right Rotate data memory right through carry with result in ACC Rotate data memory right through carry Rotate data memory left with result in ACC Rotate data memory left Rotate data memory left through carry with result in ACC Rotate data memory left through carry
None None C C None None C C
1 1(1) 1 1(1) 1 1(1) 1 1(1)
Move data memory to ACC Move ACC to data memory Move immediate data to ACC
None None None
1 1(1) 1 1(1) 1(1)
Clear bit of data memory Set bit of data memory
None None
Jump unconditionally Skip if data memory is zero Skip if data memory is zero with data movement to ACC Skip if bit i of data memory is zero Skip if bit i of data memory is not zero Skip if increment data memory is zero Skip if decrement data memory is zero Skip if increment data memory is zero with result in ACC Skip if decrement data memory is zero with result in ACC Subroutine call Return from subroutine Return from subroutine and load immediate data to ACC Return from interrupt
None None None None None None None None None None None None None
2 1(2) 1(2) 1(2) 1(2) 1(3) 1(3) 1(2) 1(2) 2 2 2 2 2(1) 2(1)
Read ROM code (current page) to data memory and TBLH Read ROM code (last page) to data memory and TBLH
None None
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25th May '99
HT48CXX/HT48RXX
Instruction Cycle
Mnemonic
Miscellaneous NOP CLR [m] SET [m] CLR WDT CLR WDT1 CLR WDT2 SWAP [m] SWAPA [m] HALT
Description
Flag Affected
No operation Clear data memory Set data memory Clear Watchdog timer Pre-clear Watchdog timer Pre-clear Watchdog timer Swap nibbles of data memory Swap nibbles of data memory with result in ACC Enter power down mode
None None None TO,PD TO*,PD* TO*,PD* None None TO,PD
1 1(1) 1(1) 1 1 1 1(1) 1 1
Notes: x: 8-bit immediate data m: 7-bit data memory address for HT48C10/HT48C30 m: 8-bit data memory address for HT48C50/HT48C70 A: Accumulator i: 0~7 number of bits A: Accumulator i: 0~7 number of bits addr: Program memory address
: Flag(s) is affected
-: Flag(s) is not affected *: Flag(s) may be affected by the execution status
(1)
: If a loading to PCL register occurs, the execution cycle of the instructions will be delayed one more cycle (4 system clocks). : If a skip to next instruction occurs, the execution cycle of instructions will be delayed one more cycle (4 system clocks). Otherwise the original execution cycles remain unchanged. : (1) or (2)
(2)
(3)
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HT48CXX/HT48RXX
Instruction Definition
ADC A,[m]
Add data memory and carry to the accumulator The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the accumulator. ACC ACC+[m]+C TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
ADCM A,[m]
Add the accumulator and carry to data memory The contents of the specified data memory, accumulator and the carry flag are added simultaneously, leaving the result in the specified data memory. [m] ACC+[m]+C TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
ADD A,[m]
Add data memory to the accumulator The contents of the specified data memory and the accumulator are added. The result is stored in the accumulator. ACC ACC+[m] TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
ADD A,x
Add immediate data to the accumulator The contents of the accumulator and the specified data are added, leaving the result in the accumulator. ACC ACC+x TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
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HT48CXX/HT48RXX
ADDM A,[m]
Add the accumulator to the data memory The contents of the specified data memory and the accumulator are added. The result is stored in the data memory. [m] ACC+[m] TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
AND A,[m]
Logical AND accumulator with data memory Data in the accumulator and the specified data memory perform a bitwise logical_AND operation. The result is stored in the accumulator. ACC ACC "AND" [m] TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
AND A,x
Logical AND immediate data to the accumulator Data in the accumulator and the specified data perform a bitwise logical_AND operation. The result is stored in the accumulator. ACC ACC "AND" x TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
ANDM A,[m]
Logical AND data memory with the accumulator Data in the specified data memory and the accumulator perform a bitwise logical_AND operation. The result is stored in the data memory. [m] ACC "AND" [m] TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
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CALL addr
Subroutine call The instruction unconditionally calls a subroutine located at the indicated address. The program counter increments once to obtain the address of the next instruction, and pushes this onto the stack. The indicated address is then loaded. Program execution continues with the instruction at this address. Stack PC+1 PC addr TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
CLR [m]
Clear data memory The contents of the specified data memory are cleared to zero. [m] 00H TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
CLR [m].i
Clear bit of data memory The bit i of the specified data memory is cleared to zero. [m].i 0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
CLR WDT
Clear watchdog timer The WDT and the WDT Prescaler are cleared (re-counting from zero). The power down bit (PD) and time-out bit (TO) are cleared. WDT and WDT Prescaler 00H PD and TO 0 TC2 - TC1 - TO 0 PD 0 OV - Z - AC - C -
Description Operation Affected flag(s)
34
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HT48CXX/HT48RXX
CLR WDT1
Preclear watchdog timer The TD, PD flags, WDT and the WDT Prescaler has cleared (re-counting from zero), if the other preclear WDT instruction has been executed. Only execution of this instruction without the other preclear instruction sets the indicated flag which implies that this instruction has been executed and the TO and PD flags remain unchanged. WDT and WDT Prescaler 00H* PD and TO 0* TC2 - TC1 - TO 0* PD 0* OV - Z - AC - C -
Description
Operation Affected flag(s)
CLR WDT2
Preclear watchdog timer The TO, PD flags, WDT and the WDT Prescaler are cleared (re-counting from zero), if the other preclear WDT instruction has been executed. Only execution of this instruction without the other preclear instruction sets the indicated flag which implies that this instruction has been executed and the TO and PD flags remain unchanged. WDT and WDT Prescaler 00H* PD and TO 0* TC2 - TC1 - TO 0* PD 0* OV - Z - AC - C -
Description
Operation Affected flag(s)
CPL [m]
Complement data memory Each bit of the specified data memory is logically complemented (1's complement). Bits which previously contained a one are changed to zero and vice-versa. [m] [m] TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
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HT48CXX/HT48RXX
CPLA [m]
Complement data memory and place result in the accumulator Each bit of the specified data memory is logically complemented (1's complement). Bits which previously contained a one are changed to zero and vice-versa. The complemented result is stored in the accumulator and the contents of the data memory remain unchanged. ACC [m] TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
DAA [m]
Decimal-Adjust accumulator for addition The accumulator value is adjusted to the BCD (Binary Code Decimal) code. The accumulator is divided into two nibbles. Each nibble is adjusted to the BCD code and an internal carry (AC1) will be done if the low nibble of the accumulator is greater than 9. The BCD adjustment is done by adding 6 to the original value if the original value is greater than 9 or a carry (AC or C) is set; otherwise the original value remains unchanged. The result is stored in the data memory and only the carry flag (C) may be affected. If ACC.3~ACC.0 >9 or AC=1 then [m].3~[m].0 (ACC.3~ACC.0)+6, AC1=AC else [m].3~[m].0) (ACC.3~ACC.0), AC1=0 and If ACC.7~ACC.4+AC1 >9 or C=1 then [m].7~[m].4 ACC.7~ACC.4+6+AC1,C=1 else [m].7~[m].4 ACC.7~ACC.4+AC1,C=C TC2 - TC1 - TO - PD - OV - Z - AC - C
Description
Operation
Affected flag(s)
DEC [m]
Decrement data memory Data in the specified data memory is decremented by one. [m] [m]-1 TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
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HT48CXX/HT48RXX
DECA [m]
Decrement data memory and place result in the accumulator Data in the specified data memory is decremented by one, leaving the result in the accumulator. The contents of the data memory remain unchanged. ACC [m]-1 TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
HALT
Enter power down mode This instruction stops program execution and turns off the system clock. The contents of the RAM and registers are retained. The WDT and prescaler are cleared. The power down bit (PD) is set and the WDT time-out bit (TO) is cleared. PC PC+1 PD 1 TO 0 TC2 - TC1 - TO 0 PD 1 OV - Z - AC - C -
Description
Operation
Affected flag(s)
INC [m]
Increment data memory Data in the specified data memory is incremented by one. [m] [m]+1 TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
INCA [m]
Increment data memory and place result in the accumulator Data in the specified data memory is incremented by one, leaving the result in the accumulator. The contents of the data memory remain unchanged. ACC [m]+1 TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
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HT48CXX/HT48RXX
JMP addr
Directly jump The contents of the program counter are replaced with the directly-specified address unconditionally, and control is passed to this destination. PC addr TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
MOV A,[m]
Move data memory to the accumulator The contents of the specified data memory are copied to the accumulator. ACC [m] TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
MOV A,x
Move immediate data to the accumulator The 8-bit data specified by the code is loaded into the accumulator. ACC x TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
MOV [m],A
Move the accumulator to data memory The contents of the accumulator are copied to the specified data memory (one of the data memories). [m] ACC TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
NOP
No operation No operation is performed. Execution continues with the next instruction. PC PC+1 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
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HT48CXX/HT48RXX
OR A,[m]
Logical OR accumulator with data memory Data in the accumulator and the specified data memory (one of the data memories) perform a bitwise logical_OR operation. The result is stored in the accumulator. ACC ACC "OR" [m] TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
OR A,x
Logical OR immediate data to the accumulator Data in the accumulator and the specified data perform a bitwise logical_OR operation. The result is stored in the accumulator. ACC ACC "OR" x TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
ORM A,[m]
Logical OR data memory with the accumulator Data in the data memory (one of the data memories) and the accumulator perform a bitwise logical_OR operation. The result is stored in the data memory. [m] ACC "OR" [m] TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
RET
Return from subroutine The program counter is restored from the stack. This is a two-cycle instruction. PC Stack TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
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HT48CXX/HT48RXX
RET A,x
Return and place immediate data in the accumulator The program counter is restored from the stack and the accumulator loaded with the specified 8-bit immediate data. PC Stack ACC x TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
RETI
Return from interrupt The program counter is restored from the stack, and interrupts are enabled by setting the EMI bit. EMI is the enable master (global) interrupt bit (bit 0; register INTC). PC Stack EMI 1 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
RL [m]
Rotate data memory left The contents of the specified data memory are rotated one bit left with bit 7 rotated into bit 0. [m].(i+1) [m].i; [m].i:bit i of the data memory (i=0-6) [m].0 [m].7 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
RLA [m]
Rotate data memory left and place result in the accumulator Data in the specified data memory is rotated one bit left with bit 7 rotated into bit 0, leaving the rotated result in the accumulator. The contents of the data memory remain unchanged. ACC.(i+1) [m].i; [m].i:bit i of the data memory (i=0-6) ACC.0 [m].7 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
40
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HT48CXX/HT48RXX
RLC [m]
Rotate data memory left through carry The contents of the specified data memory and the carry flag are rotated one bit left. Bit 7 replaces the carry bit; the original carry flag is rotated into the bit 0 position. [m].(i+1) [m].i; [m].i:bit i of the data memory (i=0-6) [m].0 C C [m].7 TC2 - TC1 - TO - PD - OV - Z - AC - C
Description
Operation
Affected flag(s)
RLCA [m]
Rotate left through carry and place result in the accumulator Data in the specified data memory and the carry flag are rotated one bit left. Bit 7 replaces the carry bit and the original carry flag is rotated into bit 0 position. The rotated result is stored in the accumulator but the contents of the data memory remain unchanged. ACC.(i+1) [m].i; [m].i:bit i of the data memory (i=0-6) ACC.0 C C [m].7 TC2 - TC1 - TO - PD - OV - Z - AC - C
Description
Operation
Affected flag(s)
RR [m]
Rotate data memory right The contents of the specified data memory are rotated one bit right with bit 0 rotated to bit 7. [m].i [m].(i+1); [m].i:bit i of the data memory (i=0-6) [m].7 [m].0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
41
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HT48CXX/HT48RXX
RRA [m]
Rotate right-place result in the accumulator Data in the specified data memory is rotated one bit right with bit 0 rotated into bit 7, leaving the rotated result in the accumulator. The contents of the data memory remain unchanged. ACC.(i) [m].(i+1); [m].i:bit i of the data memory (i=0-6) ACC.7 [m].0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
RRC [m]
Rotate data memory right through carry The contents of the specified data memory and the carry flag are together rotated one bit right. Bit 0 replaces the carry bit; the original carry flag is rotated into the bit 7 position. [m].i [m].(i+1); [m].i:bit i of the data memory (i=0-6) [m].7 C C [m].0 TC2 - TC1 - TO - PD - OV - Z - AC - C
Description
Operation
Affected flag(s)
RRCA [m]
Rotate right through carry-place result in the accumulator Data of the specified data memory and the carry flag are rotated one bit right. Bit 0 replaces the carry bit and the original carry flag is rotated into the bit 7 position. The rotated result is stored in the accumulator. The contents of the data memory remain unchanged. ACC.i [m].(i+1); [m].i:bit i of the data memory (i=0-6) ACC.7 C C [m].0 TC2 - TC1 - TO - PD - OV - Z - AC - C
Description
Operation
Affected flag(s)
42
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HT48CXX/HT48RXX
SBC A,[m]
Subtract data memory and carry from the accumulator The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the accumulator. ACC ACC+[m]+C TC2 - TC1 - TO - PD - OV
Description
Operation Affected flag(s)
Z
AC
C
SBCM A,[m]
Subtract data memory and carry from the accumulator The contents of the specified data memory and the complement of the carry flag are subtracted from the accumulator, leaving the result in the data memory. [m] ACC+[m]+C TC2 - TC1 - TO - PD - OV
Description
Operation Affected flag(s)
Z
AC
C
SDZ [m]
Skip if decrement data memory is zero The contents of the specified data memory are decremented by one. If the result is zero, the next instruction is skipped. If the result is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if ([m]-1)=0, [m] ([m]-1) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
SDZA [m]
Decrement data memory and place result in ACC, skip if zero The contents of the specified data memory are decremented by one. If the result is zero, the next instruction is skipped. The result is stored in the accumulator but the data memory remains unchanged. If the result is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if ([m]-1)=0, ACC ([m]-1) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
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HT48CXX/HT48RXX
SET [m]
Set data memory Each bit of the specified data memory is set to one. [m] FFH TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
SET [m].i
Set bit of data memory Bit "i" of the specified data memory is set to one. [m].i 1 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
SIZ [m]
Skip if increment data memory is zero The contents of the specified data memory are incremented by one. If the result is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if ([m]+1)=0, [m] ([m]+1) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
SIZA [m]
Increment data memory and place result in ACC, skip if zero The contents of the specified data memory are incremented by one. If the result is zero, the next instruction is skipped and the result is stored in the accumulator. The data memory remains unchanged. If the result is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if ([m]+1)=0, ACC ([m]+1) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
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HT48CXX/HT48RXX
SNZ [m].i
Skip if bit "i" of the data memory is not zero If bit "i" of the specified data memory is not zero, the next instruction is skipped. If bit "i" of the data memory is not zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if [m].i0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
SUB A,[m]
Subtract data memory from the accumulator The specified data memory is subtracted from the contents of the accumulator, leaving the result in the accumulator. ACC ACC+[m]+1 TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
SUBM A,[m]
Subtract data memory from the accumulator The specified data memory is subtracted from the contents of the accumulator, leaving the result in the data memory. [m] ACC+[m]+1 TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
SUB A,x
Subtract immediate data from the accumulator The immediate data specified by the code is subtracted from the contents of the accumulator, leaving the result in the accumulator. ACC ACC+x+1 TC2 - TC1 - TO - PD - OV
Description Operation Affected flag(s)
Z
AC
C
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HT48CXX/HT48RXX
SWAP [m]
Swap nibbles within the data memory The low-order and high-order nibbles of the specified data memory (one of the data memories) are interchanged. [m].3~[m].0 [m].7~[m].4 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
SWAPA [m]
Swap data memory-place result in the accumulator The low-order and high-order nibbles of the specified data memory are interchanged, writing the result to the accumulator. The contents of the data memory remain unchanged. ACC.3~ACC.0 [m].7~[m].4 ACC.7~ACC.4 [m].3~[m].0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
SZ [m]
Skip if data memory is zero If the contents of the specified data memory are zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if [m]=0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
SZA [m]
Move data memory to ACC, skip if zero The contents of the specified data memory are copied to the accumulator. If the contents is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if [m]=0, ACC [m] TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
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HT48CXX/HT48RXX
SZ [m].i
Skip if bit "i" of the data memory is zero If bit "i" of the specified data memory is zero, the following instruction, fetched during the current instruction execution, is discarded and a dummy cycle is replaced to get the proper instruction (two cycles). Otherwise proceed with the next instruction (one cycle). Skip if [m].i=0 TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
TABRDC [m]
Move the ROM code (current page) to TBLH and data memory The low byte of ROM code (current page) addressed by the table pointer (TBLP) is moved to the specified data memory and the high byte transferred to TBLH directly. [m] ROM code (low byte) TBLH ROM code (high byte) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description
Operation Affected flag(s)
TABRDL [m]
Move the ROM code (last page) to TBLH and data memory The low byte of ROM code (last page) addressed by the table pointer (TBLP) is moved to the data memory and the high byte transferred to TBLH directly. [m] ROM code (low byte) TBLH ROM code (high byte) TC2 - TC1 - TO - PD - OV - Z - AC - C -
Description Operation Affected flag(s)
XOR A,[m]
Logical XOR accumulator with data memory Data in the accumulator and the indicated data memory perform a bitwise logical Exclusive_OR operation and the result is stored in the accumulator. ACC ACC "XOR" [m] TC2 - TC1 - TO - PD - OV - Z
Description Operation Affected flag(s)
AC -
C -
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HT48CXX/HT48RXX
XORM A,[m]
Logical XOR data memory with the accumulator Data in the indicated data memory and the accumulator perform a bitwise logical Exclusive_OR operation. The result is stored in the data memory. The zero flag is affected. [m] ACC "XOR" [m] TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
XOR A,x
Logical XOR immediate data to the accumulator Data in the the accumulator and the specified data perform a bitwise logical Exclusive_OR operation. The result is stored in the accumulator. The zero flag is affected. ACC ACC "XOR" x TC2 - TC1 - TO - PD - OV - Z
Description
Operation Affected flag(s)
AC -
C -
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HT48CXX/HT48RXX
Characteristic Curves
Figure A: Typical RC oscillator frequency vs. temperature
Figure B: Typical RC oscillator frequency vs. VDD
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HT48CXX/HT48RXX
Figure C: IOH vs. VOH, VDD=3V Figure D: IOH vs. VOH, VDD=5V
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HT48CXX/HT48RXX
Figure E: IOL vs. VOL, VDD=3V Figure F: IOL vs. VOL, VDD=5V
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HT48CXX/HT48RXX
Figure G: VDD vs. RPH in Max. Figure H: VDD vs. RPH in Min.
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HT48CXX/HT48RXX
Figure I: VIH, VIL vs. VDD in -40C to +85C
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HT48CXX/HT48RXX
Figure J: Typical ISTB vs. VDD watchdog enabled
Figure K: Typical ISTB vs. VDD watchdog disabled
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HT48CXX/HT48RXX
Figure L: Maximum IDD vs. Frequency (external clock -40C To 85C)
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HT48CXX/HT48RXX
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HT48CXX/HT48RXX
Figure M: Operating voltage-Operating frequency (crystal)
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HT48CXX/HT48RXX
Figure N: Operating voltage vs. T WDT
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HT48CXX/HT48RXX
Holtek Semiconductor Inc. (Headquarters) No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C. Tel: 886-3-563-1999 Fax: 886-3-563-1189 Holtek Semiconductor Inc. (Taipei Office) 5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C. Tel: 886-2-2782-9635 Fax: 886-2-2782-9636 Fax: 886-2-2782-7128 (International sales hotline) Holtek Microelectronics Enterprises Ltd. RM.711, Tower 2, Cheung Sha Wan Plaza, 833 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Copyright (c) 1999 by HOLTEK SEMICONDUCTOR INC. The information appearing in this Data Sheet is believed to be accurate at the time of publication. However, Holtek assumes no responsibility arising from the use of the specifications described. The applications mentioned herein are used solely for the purpose of illustration and Holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holtek reserves the right to alter its products without prior notification. For the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
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25th May '99

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