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| EM78P156EL OTP ROM 1. GENERAL DESCRIPTION EM78P156EL is an 8-bit microprocessor designed and developed with low-power and high-speed CMOS technology. It is equipped with 1K*13-bits Electrical One Time Programmable Read Only Memory (OTP-ROM). It provides a PROTECTION bit to p revent user's code in the OTP memory from being intruded. 6 OPTION bits are also available to meet user's requirements. With its OTP-ROM feature, the EM78P156EL is able to offer a convenient way of developing and verifying user's programs. Moreover, user can take advantage of EMC Writer to easily program his development code. This specification is subject to change without prior notice. 1 2002/04/19 EM78P156EL OTP ROM 2. FEATURES * Operating voltage range : 2.3V~5.5V * Operating temperature range: 0C~70C * Operating frequency rang (base on 2 clocks ): * Crystal mode: DC~20MHz at 5V, DC~8MHz at 3V, DC~4MHz at 2.3V. * ERC mode: DC~4MHz at 5V, DC~4MHz at 3V, DC~4MHz at 2.3V. * Low power consumption: * Less then 1.6 mA at 5V/4MHz * Typically 15 A at 3V/32KHz * Typically 1 A during sleep mode * 1K x 13 bits on chip ROM * One security register to prevent intrusion of OTP memory codes * One configuration register to accommodate user's requirements * 48x 8 bits on chip registers (SRAM, general purpose register) * 2 bi-directional I/O ports * 5 level stacks for subroutine nesting * 8-bit real time clock/counter (TCC) with selective signal sources, trigger edges, and overflow interrupt * Two clocks per instruction cycle * Power down (SLEEP) mode * Three available interruptions * TCC overflow interrupt * Input-port status changed interrupt (wake up from sleep mode) * External interrupt * Programmable free running watchdog timer * 8 programmable pull-high pins * 7 programmable pull-down pins * 8 programmable open-drain pins * 2 programmable R-option pins * Package types: * 18 pin DIP 300mil : EM78P156ELP * 18 pin SOP(SOIC) 300mil : EM78P156ELM This specification is subject to change without prior notice. 2 2002/04/19 EM78P156EL OTP ROM * 20 pin SSOP 209mil * 20 pin SSOP 209mil : EM78P156ELAS : EM78P156ELKM * 99.9% single instruction cycle commands * The transient point of system frequency between HXT and LXT is around 400KHz This specification is subject to change without prior notice. 3 2002/04/19 EM78P156EL OTP ROM 3. PIN ASSIGNMENTS EM78P156ELP EM78P156ELM P52 P53 TCC /RESET VSS P60//INT P61 P62 P63 1 2 3 4 5 6 7 8 9 DIP SOP SOIC 18 17 16 15 14 13 12 11 10 P51 P50 OSCI OSCO VDD P67 P66 P65 P64 NC P52 P53 TCC /RESET VSS P60//INT P61 P62 P63 EM78P156ELAS 1 2 3 4 5 6 7 8 9 10 SSOP 20 19 18 17 16 15 14 13 12 11 NC P51 P50 OSCI OSCO VDD P67 P66 P65 P64 P52 P53 TCC /RESET VSS VSS P60//INT P61 P62 P63 EM78P156ELKM 1 2 3 4 5 6 7 8 9 10 SSOP 20 19 18 17 16 15 14 13 12 11 P51 P50 OSCI OSCO VDD VDD P67 P66 P65 P64 Fig. 1 Pin Assignment Table 1 EM78P156ELP and EM78P156ELM Pin Description Symbol VDD OSCI OSCO TCC /RESET P50~P53 Pin No. 14 16 15 3 4 17, 18, 1, 2 6~13 6 5 Type I I/O I I I/O Function * Power supply. * XTAL type: Crystal input terminal or external clock input pin. * ERC type: RC oscillator input pin. * XTAL type: Output terminal for crystal oscillator or external clock input pin. * RC type: Instruction clock output. * External clock signal input. * The real time clock/counter (with Schmitt trigger input pin), must be tied to VDD or VSS if not in use. * Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain in reset condition. * P50~P53 are bi-directional I/O pins. * P50 and P51 can also be defined as the R-option pins. * P50~P52 can be pulled-down by software. * P60~P67 are bi-directional I/O pins. * These can be pulled-high or can be open-drain by software programming. * P60~P63 can also be pulled-down by software. * External interrupt pin triggered by falling edge. * Ground. P60~P67 /INT VSS I/O I - This specification is subject to change without prior notice. 4 2002/04/19 EM78P156EL OTP ROM Table 2 EM78P156ELAS Pin Description Symbol VDD OSCI OSCO TCC /RESET P50~P53 P60~P67 /INT VSS Pin No. 15 17 16 4 5 18, 19, 2, 3 7~14 7 6 Type I I/O I I I/O I/O I Function * Power supply. * XTAL type: Crystal input terminal or external clock input pin. * ERC type: RC oscillator input pin. * XTAL type: Output terminal for crystal oscillator or external clock input pin. * RC type: Instruction clock output. * External clock signal input. * The real time clock/counter (with Schmitt trigger input pin), must be tied to VDD or VSS if not in use. * Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain in reset condition. * P50~P53 are bi-directional I/O pins. * P50 and P51 can also be defined as the R-option pins. * P50~P52 can be pulled-down by software. * P60~P67 are bi-directional I/O pins. * These can be pulled-high or can be open-drain by software programming. * P60~P63 can also be pulled-down by software. * External interrupt pin triggered by falling edge. * Ground. Table 3 EM78P156ELKM Pin Description Symbol VDD OSCI OSCO TCC /RESET P50~P53 Pin No. 15,16 18 17 3 4 19, 20, 1, 2 7~14 7 5, 6 Type I I/O I I I/O Function * Power supply. * XTAL type: Crystal input terminal or external clock input pin. * ERC type: RC oscillator input pin. * XTAL type: Output terminal for crystal oscillator or external clock input pin. * RC type: Instruction clock output. * External clock signal input. * The real time clock/counter (with Schmitt trigger input pin), must be tied to VDD or VSS if not in use. * Input pin with Schmitt trigger. If this pin remains at logic low, the controller will also remain in reset condition. * P50~P53 are bi-directional I/O pins. * P50 and P51 can also be defined as the R-option pins. * P50~P52 can be pulled-down by software. * P60~P67 are bi-directional I/O pins. * These can be pulled-high or can be open-drain by software programming. * P60~P63 can also be pulled-down by software. * External interrupt pin triggered by falling edge. * Ground. P60~P67 /INT VSS I/O I - This specification is subject to change without prior notice. 5 2002/04/19 EM78P156EL OTP ROM 4. FUNCTION DESCRIPTION OSCI OSCO /RESET WDT Timer TCC /INT PC STACK 1 STACK 2 STACK 3 Oscillator/Timing Control Prescale r Internal C External R oscillator WDT Time-out ROM IOCA Interrupt Control STACK 4 STACK 5 R1(TCC) Sleep & Wake Control Instruction Register ALU RAM R4 Instruction Decoder R3 AC DATA & CONTROL BUS IOC5 R5 IOC6 R6 PPPP 5555 0123 PPPPPPPP 66 66 66 66 01 23 45 67 Fig. 2 Function Block Diagram 4.1 Operational Registers 1. R0 (Indirect Addressing Register) R0 is not a physically implemented register. Its major function is to perform as an indirect addressing pointer. Any instruction using R0 as a pointer actually accesses data pointed by the RAM Select Register (R4). 2. R1 (Time Clock /Counter) * Increased by an external signal edge, which is defined by TE bit (CONT-4) through the TCC pin, or by the instruction cycle clock. * Writable and readable as any other registers. This specification is subject to change without prior notice. 6 2002/04/19 EM78P156EL OTP ROM * Defined by resetting PAB(CONT-3). * The prescaler is assigned to TCC, if the PAB bit (CONT-3) is reset. * The contents of the prescaler counter will be cleared only when TCC register is written with a value. 3. R2 (Program Counter) & Stack * Depending on the device type, R2 and hardware stack are 10-bit wide. The structure is depicted in Fig.3. * Generating 1024x13 bits on-chip OTP ROM addresses to the relative programming instruction codes. One program page is 1024 words long. * R2 is set as all "0"s when under RESET condition. * "JMP" instruction allows direct loading of the lower 10 program counter bits. Thus, "JMP" allows PC to go to any location within a page. * "CALL" instruction loads the lower 10 bits of the PC, and then PC+1 is pushed into the stack. Thus, the subroutine entry address can be located anywhere within a page. * "RET" ("RETL k", "RETI") instruction loads the program counter with the contents of the top-level stack. * "ADD R2, A" allows the contents of `A' to be added to the current PC, and the ninth and tenth bits of the PC are cleared. * "MOV R2, A" allows to load an address from the "A" register to the lower 8 bits of the PC, and the ninth and tenth bits of the PC are cleared. * Any instruction that writes to R2 (e.g., "ADD R2,A", "MOV R2,A", "BC R2,6",) will cause the ninth and tenth bits (A8~A9) of the PC to be cleared. Thus, the computed jump is limited to the first 256 locations of a page. * All instruction are single instruction cycle (fclk/2 or fclk/4) except for the instruction that would change the contents of R2. Such instruction will need one more instruction cycle. CALL PC A 9 A8 A7 ~ A0 RET RETL RETL K PA G E 0 3FF Fig. 3 Program Counter Organization This specification is subject to change without prior notice. 7 000 Stack Stack Stack Stack 1 2 3 4 Stack 5 2002/04/19 EM78P156EL OTP ROM 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 R0 R1(TCC) R2(PC) R3(Status) R4(RSR) R5(Port5) R6(Port6) Stack (5 level) IOC5 IOC6 RF R10 : : 48x8 Common Register R3F IOCA IOCB IOCC IOCD IOCE IOCF : : 3F Fig. 4 Data Memory Configuration 4. R3 (Status Register) 7 GP2 6 GP1 5 GP0 4 T 3 P 2 Z 1 DC 0 C * Bit 0 (C) Carry flag * Bit 1 (DC) Auxiliary carry flag * Bit 2 (Z) Zero flag. This specification is subject to change without prior notice. 8 2002/04/19 EM78P156EL OTP ROM Set to "1" if the result of an arithmetic or logic operation is zero. * Bit 3 (P) Power down bit. Set to 1 during power on or by a "WDTC" command and reset to 0 by a "SLEP" command. * Bit 4 (T) Time-out bit. Set to 1 with the "SLEP" and "WDTC" commands, or during power up and reset to 0 by WDT time-out. * Bit5 ~7 (GP0 ~ 2) General-purpose read/write bits. 5. R4 (RAM Select Register) * Bits 0~5 are used to select registers (address: 00~06, 0F~3F) in the indirect addressing mode. * Bits 6~7 are not used (read only). * The Bits 6~7 set to "1" at all time. * Z flag of R3 wi ll set to "1" when R4 content is equal to "3F." When R4=R4+1, R4 content will select as R0. * See the configuration of the data memory in Fig. 4. 6. R5 ~ R6 (Port 5 ~ Port 6) * R5 and R6 are I/O registers. * Only the lower 4 bits of R5 are available. 7. RF (Interrupt Status Register) 7 6 5 4 3 2 EXIF 1 ICIF 0 TCIF "1" means interrupt request, and "0" means no interrupt occurs. * Bit 0 (TCIF) TCC overflow interrupt flag. Set when TCC overflows, reset by software. * Bit 1 (ICIF) Port 6 input status change interrupt flag. Set when Port 6 input changes, reset by software. * Bit 2 (EXIF) External interrupt flag. Set by falling edge on /INT pin, reset by software. * Bits 3 ~ 7 Not used. * RF can be cleared by instruction but cannot be set. * IOCF is the interrupt mask register. * Note that the result of reading RF is the "logic AND" of RF and IOCF. 8. R10 ~ R3F * All of these are 8-bit general-purpose registers. This specification is subject to change without prior notice. 9 2002/04/19 EM78P156EL OTP ROM 4.2 Special Purpose Registers 1. A (Accumulator) * Internal data transfer, or instruction operand holding * It cannot be addressed. 2. CONT (Control Register) 7 PSR2 0 0 0 0 1 1 1 1 6 /INT PSR1 0 0 1 1 0 0 1 1 PSR0 0 1 0 1 0 1 0 1 5 TS 4 TE TCC Rate 1:2 1:4 1:8 1:16 1:32 1:64 1:128 1:256 3 PAB 2 PSR2 WDT Rate 1:1 1:2 1:4 1:8 1:16 1:32 1:64 1:128 1 PSR1 0 PSR0 * Bit 0 (PSR0) ~ Bit 2 (PSR2) TCC/WDT prescaler bits. * Bit 3 (PAB) Prescaler assignment bit. 0: TCC 1: WDT * Bit 4 (TE) TCC signal edge 0: increment if the transition from low to high takes place on TCC pin 1: increment if the transition from high to low takes place on TCC pin * Bit 5 (TS) TCC signal source 0: internal instruction cycle clock 1: transition on TCC pin * Bit 6 (/INT) Interrupt enable flag 0: masked by DISI or hardware interrupt 1: enabled by ENI/RETI instructions * Bit 7 Not used. * CONT register is both readable and writable. 3. IOC5 ~ IOC6 (I/O Port Control Register) * "1" put the relative I/O pin into high impedance, while "0" defines the relative I/O pin as output. * Only the lower 4 bits of IOC5 can be defined. * IOC5 and IOC6 registers are both readable and writable. This specification is subject to change without prior notice. 10 2002/04/19 EM78P156EL OTP ROM 4. IOCA (Prescaler Counter Register) * IOCA register is readable. * The value of IOCA is equal to the contents of Prescaler counter. * Down counter. 5. IOCB (Pull-down Control Register) 7 /PD7 6 /PD6 5 /PD5 4 /PD4 3 2 /PD2 1 /PD1 0 /PD0 * Bit 0 (/PD0) Control bit is used to enable the pull-down of P50 pin. 0: Enable internal pull-down 1: Disable internal pull-down * Bit 1 (/PD1) Control bit is used to enable the pull-down of P51 pin. * Bit 2 (/PD2) Control bit is used to enable the pull-down of P52 pin. * Bit 3 Not used. * Bit 4 (/PD4) Control bit is used to enable the pull-down of P60 pin. * Bit 5 (/PD5) Control bit is used to enable the pull-down of P61 pin. * Bit 6 (/PD6) Control bit is used to enable the pull-down of P62 pin. * Bit 7 (/PD7) Control bit is used to enable the pull-down of P63 pin. * IOCB Register is both readable and writable. 6. IOCC (Open-drain Control Register) 7 OD7 6 OD6 5 OD5 4 OD4 3 OD3 2 OD2 1 OD1 0 OD0 * Bit 0 (OD0) Control bit is used to enable the open-drain of P60 pin. 0: Disable open-drain output 1: Enable open-drain output * Bit 1 (OD1) Control bit is used to enable the open-drain of P61 pin. * Bit 2 (OD2) Control bit is used to enable the open-drain of P62 pin. * Bit 3 (OD3) Control bit is used to enable the open-drain of P63 pin. * Bit 4 (OD4) Control bit is used to enable the open-drain of P64 pin. * Bit 5 (OD5) Control bit is used to enable the open-drain of P65 pin. * Bit 6 (OD6) Control bit is used to enable the open-drain of P66 pin. * Bit 7 (OD7) Control bit is used to enable the open-drain of P67 pin. * IOCC Register is both readable and writable. This specification is subject to change without prior notice. 11 2002/04/19 EM78P156EL OTP ROM 7. IOCD (Pull-high Control Register) 7 /PH7 6 /PH6 5 /PH5 4 /PH4 3 /PH3 2 /PH2 1 /PH1 0 /PH0 * Bit 0 (/PH0) Control bit is used to enable the pull-high of P60 pin. 0: Enable internal pull-high 1: Disable internal pull-high * Bit 1 (/PH1) Control bit is used to enable the pull-high of P61 pin. * Bit 2 (/PH2) Control bit is used to enable the pull-high of P62 pin. * Bit 3 (/PH3) Control bit is used to enable the pull-high of P63 pin. * Bit 4 (/PH4) Control bit is used to enable the pull-high of P64 pin. * Bit 5 (/PH5) Control bit is used to enable the pull-high of P65 pin. * Bit 6 (/PH6) Control bit is used to enable the pull-high of P66 pin. * Bit 7 (/PH7) Control bit is used to enable the pull-high of P67 pin. * IOCD Register is both readable and writable. 8. IOCE (WDT Control Register) 7 WDTE 6 EIS 5 4 ROC 3 2 1 0 - * Bit 7 (WDTE) Control bit used to enable Watchdog timer. 0: Disable WDT. 1: Enable WDT. WDTE is both readable and writable. * Bit 6 (EIS) Control bit is used to define the function of P60 (/INT) pin. 0: P60, bi-directional I/O pin. 1: /INT, external interrupt pin. In this case, the I/O control bit of P60 (bit 0 of IOC6) must be set to "1". When EIS is "0", the path of /INT is masked. When EIS is "1", the status of /INT pin can also be read by way of reading Port 6 (R6). Refer to Fig. 7(a). EIS is both readable and writable. * Bit 4 (ROC) ROC is used for the R-option. Setting the ROC to "1" will enable the status of R -option pins (P50P51) that are read by the controller. Clearing the ROC will disable the R-option function. If the R-option function is selected, user must connect the P51 pin or/and P50 pin to VSS with a 430K external resistor (Rex). If the Rex is connected/disconnected, the status of P50 (P51) is read as "0"/"1". Refer to Fig. 8. * Bits 0~3,5 Not used. This specification is subject to change without prior notice. 12 2002/04/19 EM78P156EL OTP ROM 9. IOCF (Interrupt Mask Register) 7 6 5 4 3 2 EXIE 1 ICIE 0 TCIE * Bit 0 (TCIE) TCIF interrupt enable bit. 0: disable TCIF interrupt 1: enable TCIF interrupt * Bit 1 (ICIE) ICIF interrupt enable bit. 0: disable ICIF interrupt 1: enable ICIF interrupt * Bit 2 (EXIE) EXIF interrupt enable bit. 0: disable EXIF interrupt 1: enable EXIF interrupt * Bits 3~7 Not used. * Individual interrupt is enabled by setting its associated control bit in the IOCF to "1". * Global interrupt is enabled by the ENI instruction and is disabled by the DISI instruction. Refer to Fig. 10. * IOCF register is both readable and writable. This specification is subject to change without prior notice. 13 2002/04/19 EM78P156EL OTP ROM 4.3 TCC/WDT & Prescaler An 8-bit counter available as prescaler for the TCC or WDT. The prescaler is available for either the TCC or WDT only at any given time, and the PAB bit of the CONT register is used to determine the prescaler assignment. The PSR0~PSR2 bits determine the ratio. The prescaler is cleared each time the instruction is written to TCC under TCC mode. The WDT and prescaler, when assigned to WDT mode, are cleared by the "WDTC" or "SLEP" instructions. Fig. 5 depicts the circuit diagram of TCC/WDT. * R1 (TCC) is an 8-bit timer/counter. The clock source of TCC can be internal or external clock input (edge selectable from TCC pin). If TCC signal source is from internal clock, TCC will increase by 1 at every instruction cycle (without prescaler). Referring to Fig. 5, CLK=Fosc/2 or CLK=Fosc/4 application is determined by the CODE Option bit CLK status. CLK=Fosc/2 is used if CLK bit is "0", and CLK=Fosc/4 is used if CLK bit is "1". If TCC signal source comes from external clock input, TCC is increased by 1 at every falling edge or rising edge of TCC pin. * The watchdog timer is a free running on-chip RC oscillator. The WDT will keep on running even when the oscillator driver has been turned off (i.e. in sleep mode). During normal operation or sleep mode, a WDT time-out (if enabled) will cause the device to reset. The WDT can be enabled or disabled any time during normal mode by software programming. Refer to WDTE bit of IOCE register. Without prescaler, the WDT time-out period is approximately 18 ms 1 (default). CLK(=Fosc/2 or Fosc/4) TCC Pin TE TS 0 0 Data Bus M U X 1 1 0 M U X PAB SYNC 2 cycles TCC (R1) TCC overflow interrupt WDT 1 M U X PAB 8-bit Counter M U X PAB PSR0~PSR2 IOCA WTE (in IOCE) 8-to-1 MUX Initial value 0 1 MUX WDT time-out PAB Fig. 5 Block Diagram of TCC and WDT 1 14 2002/04/19 This specification is subject to change without prior notice. EM78P156EL OTP ROM 4.4 I/O Ports The I/O registers, both Port 5 and Port 6, are bi-directional tri-state I/O ports. Port 6 can be pulled high internally by software. In addition, Port 6 can also have open-drain output by software. Input status change interrupt (or wake-up) function on Port 6. P50 ~ P52 and P60 ~ P63 pins can be pulled down by software. Each I/O pin can be defined as "input" or "output" pin by the I/O control register (IOC5 ~ IOC6). P50~P51 are the R -option pins enabled by setting the ROC bit in the IOCE register to 1. When the R-option function is used, it is recommended that P50~P51 are used as output pins. When R-option is in enable state, P50~P51 must be programmed as input pins. Under R -option mode, the current/power consumption by Rex should be taken into the consideration to promote energy conservation. The I/O registers and I/O control registers are both readable and writable. The I/O interface circuits for Port 5 and Port 6 are shown in the following Figures 6, 7(a), 7(b), and Figure 8. PCRD Q _ Q P R C L D CLK PCWR PORT Q _ Q P R C L D CLK PDWR IOD PDRD 0 1 M U X NOTE: Pull-down is not shown in the figure. Fig. 6 The Circuit of I/O Port and I/O Control Register for Port 5 This specification is subject to change without prior notice. 15 2002/04/19 EM78P156EL OTP ROM PCRD P Q RD _ CLK QC L PCWR P60 /INT PORT Bit 6 of IOCE DPQ R CLK _ CQ L 0 1 M U X Q _ Q P RD CLK C L IOD PDWR PDRD T10 P DRQ CLK _ CQ L INT NOTE: Pull-high (down) and Open-drain are not shown in the figure. Fig. 7(a) The Circuit of I/O Port and I/O Control Register for P60 (/INT) PCRD Q _ Q PD R CLK C L PCWR P61~P67 PORT Q _ Q 0 1 M U X PD R CLK C L IOD PDWR PDRD TIN DP R CLK C L Q _ Q NOTE: Pull-high (down) and Open-drain are not shown in the figure. Fig. 7(b) The Circuit of I/O Port and I/O Control Register for P61~P67 This specification is subject to change without prior notice. 16 2002/04/19 EM78P156EL OTP ROM IOCE.1 D P R C L Q Interrupt _ Q RE.1 ENI Instruction CLK T10 T11 P DR CLK Q Q _ Q P RD CLK _ CQ L C L T17 DISI Instruction Interrupt (Wake-up from SLEEP) /SLEP Next Instruction (Wake-up from SLEEP) Fig. 7(c) Block Diagram of I/O Port 6 with Input Change Interrupt/Wake-up Table 4 Usage of Port 6 Input Change Wake-up/Interrupt Function Usage of Port 6 input status changed Wake-up/Interrupt (I) Wake-up from Port 6 Input Status Change (a) Before SLEEP 1. Disable WDT1 (using very carefully) 2. Read I/O Port 6 (MOV R6,R6) 3. Execute "ENI" or "DISI" 4. Enable interrupt (Set IOCF.1) 5. Execute "SLEP" instruction (b) After Wake-up 1. IF "ENI" Interrupt vector (008H) 2. IF "DISI" Next instruction (II) Port 6 Input Status Change Interrupt 1. Read I/O Port 6 (MOV R6,R6) 2. Execute "ENI" 3. Enable interrupt (Set IOCF.1) 4. IF Port 6 change (interrupt) Interrupt vector (008H) 1 NOTE: Software disables WDT (watchdog timer) but hardware must be enabled before applying Port 6 Change Wake-Up function. (CODE Option Register and Bit 11 (ENWDTB-) set to "1"). This specification is subject to change without prior notice. 17 2002/04/19 EM78P156EL OTP ROM PCRD ROC VCC Q Weakly Pull-up Q P R C L D CLK PCWR PORT Q P R C L D PDWR IOD Q PDRD 0 Rex* 1 M U X *The Rex is 430K ohm external resistor Fig. 8 The Circuit of I/O Port with R-option(P50,P51) This specification is subject to change without prior notice. 18 2002/04/19 EM78P156EL OTP ROM 4.5 RESET and Wake-up 1. RESET A RESET is initiated by one of the following events(1) Power on reset. (2) /RESET pin input "low", or (3) WDT time-out (if enabled). The device is kept in a RESET condition for a period of approx. 18ms 1 (one oscillator start-up timer period) after the reset is detected. Once the RESET occurs, the following functions are performed. Refer to Fig.9. * The oscillator is running, or will be started. * The Program Counter (R2) is set to all "0". * All I/O port pins are configured as input mode (high-impedance state). * The Watchdog timer and prescaler are cleared. * When power is switched on, the upper 3 bits of R3 are cleared. * The bits of the CONT register are set to all "1" except for the Bit 6 (INT flag). * The bits of the IOCA register are set to all "1". * The bits of the IOCB register are set to all "1". * The IOCC register is cleared. * The bits of the IOCD register are set to all "1". * Bit 7 of the IOCE register is set to "1", and Bits 4 and 6 are cleared. * Bits 0~2 of RF and bits 0~2 of IOCF register are cleared. The sleep (power down) mode is asserted by executing the "SLEP" instruction. While entering sleep mode, WDT (if enabled) is cleared but keeps on running. The controller can be awakened by(1) External reset input on /RESET pin, (2) WDT time-out (if enabled), or (3) Port 6 input status changes (if enabled). The first two cases will cause the EM78P156EL to reset. The T and P flags of R3 can be used to determine the source of the reset (wake-up). The last case is considered the continuation of program execution and the global interrupt ("ENI" or "DISI" being executed) decides whether or not the 1 NOTE: Vdd = 5V, set up time period = 16.8ms 5% Vdd = 3V, set up time period = 19ms 5% This specification is subject to change without prior notice. 19 2002/04/19 EM78P156EL OTP ROM controller branches to the interrupt vector following wake-up. If ENI is executed before SLEP, the instruction will begin to execute from the address 008H after wake-up. If DISI is executed before SLEP, the operation will restart from the succeeding instruction right next to SLEP after wake-up. Only one of Cases 2 and 3 can be enabled before entering the sleep mode. That is, [a] if Port 6 Input Status Change Interrupt is enabled before SLEP , WDT must be disabled. by software. However, the WDT bit in the option register remains enabled. Hence, the EM78P156EL can be awakened only by Case 1 or 3. [b] if WDT is enabled before SLEP, Port 6 Input Status Change Interrupt must be disabled. Hence, the EM78P156EL can be awakened only by Case 1 or 2. Refer to the section on Interrupt. If Port 6 Input Status Change Interrupt is used to wake-up the EM78P156EL (Case [a] above), the following instructions must be executed before SLEP: MOV A, @xx000110b CONTW CLR R1 MOV A, @xxxx1110b CONTW WDTC MOV A, @0xxxxxxxb IOW RE MOV R6, R6 MOV A, @00000x1xb IOW RF ENI (or DISI) SLEP NOP One problem user should be aware of, is that after waking up from the sleep mode, WDT would enable automatically. The WDT operation (being enabled or disabled) should be handled appropriately by software after waking up from the sleep mode. ; Enable (or disable) global interrupt ; Sleep ; Read Port 6 ; Enable Port 6 input change interrupt ; Clear WDT and prescaler ; Disable WDT ; Clear TCC and prescaler ; Select WDT prescaler ; Select internal TCC clock This specification is subject to change without prior notice. 20 2002/04/19 EM78P156EL OTP ROM Table 5 The Summary of the Initialized Values for Registers Address Name Reset Type Bit Name N/A IOC5 Power-On /RESET and WDT Wake-Up from Pin Change Bit Name N/A IOC6 Power-On /RESET and WDT Wake-Up from Pin Change Bit Name N/A CONT Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x00 R0(IAR) Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x01 R1(TCC) Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x02 R2(PC) Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x03 R3(SR) Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x04 R4(RSR) Power-On /RESET and WDT Wake-Up from Pin Change Bit Name 0x05 P5 Power-On /RESET and WDT Wake-Up from Pin Change 0x06 P6 Bit Name Power-On /RESET and WDT This specification is subject to change without prior notice. Bit 7 X U U U C67 1 1 P X 1 1 P U P P 0 0 P 0 0 **0/P GP2 0 0 P 1 1 1 X 0 0 0 P67 U P 21 Bit 6 X U U U C66 1 1 P /INT 0 0 P U P P 0 0 P 0 0 **0/P GP1 0 0 P 1 1 1 X 0 0 0 P66 U P Bit 5 X U U U C65 1 1 P TS 1 1 P U P P 0 0 P 0 0 **0/P GP0 0 0 P U P P X 0 0 0 P65 U P Bit 4 X U U U C64 1 1 P TE 1 1 P U P P 0 0 P 0 0 **0/P T 1 t t U P P X 0 0 0 P64 U P Bit 3 C53 1 1 P C63 1 1 P PAB 1 1 P U P P 0 0 P 0 0 **1/P P 1 t t U P P P53 U P P P63 U P Bit 2 C52 1 1 P C62 1 1 P 1 1 P U P P 0 0 P 0 0 **0/P Z U P P U P P P52 U P P P62 U P Bit 1 C51 1 1 P C61 1 1 P 1 1 P U P P 0 0 P 0 0 **0/P DC U P P U P P P51 U P P P61 U P Bit 0 C50 1 1 P C60 1 1 P 1 1 P U P P 0 0 P 0 0 **0/P C U P P U P P P50 U P P P60 U P 2002/04/19 PSR2 PSR1 PSR0 EM78P156EL OTP ROM Address Name Reset Type Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit Name Power-On /RESET and WDT Wake-Up from Pin Change Bit 7 P X U U U 1 1 P /PD7 1 1 P OD7 0 0 P /PH7 1 1 P WDTE 1 1 1 X U U U U P P Bit 6 P X U U U 1 1 P /PD6 1 1 P OD6 0 0 P /PH6 1 1 P EIS 0 0 P X U U U U P P Bit 5 P X U U U 1 1 P /PD5 1 1 P OD5 0 0 P /PH5 1 1 P X U U U X U U U U P P Bit 4 P X U U U 1 1 P /PD4 1 1 P OD4 0 0 P /PH4 1 1 P ROC 0 0 P X U U U U P P Bit 3 P X U U U 1 1 P X U U U OD3 0 0 P /PH3 1 1 P X U U U X U U U U P P Bit 2 P EXIF 0 0 P 1 1 P /PD2 1 1 P OD2 0 0 P /PH2 1 1 P X U U U EXIE 0 0 P U P P Bit 1 P ICIF 0 0 P 1 1 P /PD1 1 1 P OD1 0 0 P /PH1 1 1 P X U U U ICIE 0 0 P U P P Bit 0 P TCIF 0 0 P 1 1 P /PD0 1 1 P OD0 0 0 P /PH0 1 1 P X U U U TCIE 0 0 P U P P 0x0F RF(ISR) 0x0A IOCA 0x0B IOCB 0x0C IOCC 0x0D IOCD 0x0E IOCE 0x0F IOCF 0x10~0x2F R10~R2F ** To jump address 0x08, or to execute the instruction which is next to the "SLEP" instruction. X: Not used. U: Unknown or don't care. P: Previous value before reset. t: Check Table 6 2. The Status of RST, T, and P of STATUS Register A RESET condition is initiated by the following events: 1. A power-on condition, 2. A high-low-high pulse on /RESET pin, and This specification is subject to change without prior notice. 22 2002/04/19 EM78P156EL OTP ROM 3. Watchdog timer time-out. The values of T and P, listed in Table 6 are used to check how the processor wakes up. Table 7 shows the events that may affect the status of T and P. Table 6 The Values of RST, T and P after RESET Reset Type Power on /RESET during Operating mode /RESET wake-up during SLEEP mode WDT during Operating mode WDT wake-up during SLEEP mode Wake-Up on pin change during SLEEP mode *P: Previous status before reset Table 7 The Status of T and P Being Affected by Events. Event Power on WDTC instruction WDT time-out SLEP instruction Wake-Up on pin change during SLEEP mode *P: Previous value before reset T 1 1 0 1 1 P 1 1 *P 0 0 T 1 *P 1 0 0 1 P 1 *P 0 *P 0 0 VDD Oscillator D CLK CLR Q CLK Power-on Reset Voltage Detector WDTE WDT WDT Timeout Setup Time RESET /RESET Fig. 9 Block Diagram of Controller Reset This specification is subject to change without prior notice. 23 2002/04/19 EM78P156EL OTP ROM 4.6 Interrupt The EM78P156EL has three falling-edge interrupts listed below: (1) TCC overflow interrupt (2) Port 6 Input Status Change Interrupt (3) External interrupt [(P60, /INT) pin]. Before the Port 6 Input Status Change Interrupt is enabled, reading Port 6 (e.g. "MOV R6,R6") is necessary. Each pin of Port 6 will have this feature if its status changed. Any pin configured as output or P60 pin configured as /INT is excluded from this function. The Port 6 Input Status Changed Interrupt can wake up the EM78P156EL from the sleep mode if Port 6 is enabled prior to going into the sleep mode by executing SLEP. When the chip wakes-up, the controller will continue to execute the succeeding address if the global interrupt is disabled or branch to the interrupt vector 008H if the global interrupt is enabled. RF is the interrupt status register that records the interrupt requests in the relative flags/bits. IOCF is an interrupt mask register. The global interrupt is enabled by the ENI instruction and is disabled by the DISI instruction. When one of the interrupts (enabled) occurs, the next instruction will be fetched from address 008H. Once in the interrupt service routine, the source of an interrupt can be determined by polling the flag bits in RF. The interrupt flag bit must be cleared by instructions before leaving the interrupt service routine and before interrupts are enabled to avoid recursive interrupts. The flag (except ICIF bit) in the Interrupt Status Register (RF) is set regardless of the status of its mask bit or the execution of ENI. Note that the outcome of RF will be the logic AND of RF and IOCF (refer to Fig. 10). The RETI instruction ends the interrupt routine and enables the global interrupt (the execution of ENI). When an interrupt is generated by the INT instruction (enabled), the next instruction will be fetched from address 001H. This specification is subject to change without prior notice. 24 2002/04/19 EM78P156EL OTP ROM VCC D /IRQn CLK P R C L Q _ Q RFRD IRQn INT IRQm ENI/DISI RF Q _ Q P R C L D CLK IOCFWR IOD IOCF /RESET IOCFRD RFWR Fig. 10 Interrupt Input Circuit 4.7 Oscillator 1. Oscillator Modes The EM78P156EL can be operated in three different oscillator modes, such as External RC oscillator mode (ERC), High XTAL oscillator mode (HXT), and Low XTAL oscillator mode (LXT). User can select one of them by programming MS and HLF in the CODE option register. Table 8 depicts how these three modes are defined. The up-most limited operation frequency of crystal/resonator on the different VDDs is listed in Table 9. Table 8 Oscillator Modes Defined by MS and HLP Mode ERC(External RC oscillator mode) HXT(High XTAL oscillator mode) LXT(Low XTAL oscillator mode) This specification is subject to change without prior notice. 25 2002/04/19 EM78P156EL OTP ROM Table 9 The Summary of Maximum Operating Speeds Conditions Two cycles with two clocks VDD 2.3 3.0 5.0 Fxt max.(MHz) 4.0 8.0 20.0 2. Crystal Oscillator/Ceramic Resonators (XTAL) EM78P156EL can be driven by an external clock signal through the OSCI pin as shown in Fig. 11 below. OSCI OSCO EM78P156EL Ext. Clock Fig. 11 Circuit for External Clock Input In the most applications, pin OSCI and pin OSCO can connected with a crystal or ceramic resonator to generate oscillation. Fig. 12 depicts such circuit. The same thing applies whether it is in the HXT mode or in the LXT mode. Table 10 provides the recommended values of C1 and C2. Since each resonator has its own attribute, user should refer to its specification for appropriate values of C1 and C2. RS, a serial resistor, may be necessary for AT strip cut crystal or low frequency mode. C1 OSCI EM78P156EL XTAL OSCO RS C2 Fig. 12 Circuit for Crystal/Resonator This specification is subject to change without prior notice. 26 2002/04/19 EM78P156EL OTP ROM Table 10 Capacitor Selection Guide for Crystal Oscillator or Ceramic Resonator Oscillator Type Ceramic Resonators Frequency Mode HXT Frequency 455 kHz 2.0 MHz 4.0 MHz 32.768kHz 100KHz 200KHz 455KHz 1.0MHz 2.0MHz 4.0MHz C1(pF) 100~150 20~40 10~30 25 25 25 20~40 15~30 15 15 C2(pF) 100~150 20~40 10~30 15 25 25 20~150 15~30 15 15 LXT Crystal Oscillator HXT 330 C OSCI EM78P156EL XTAL 7404 7404 330 7404 Fig. 13 Circuit for Crystal/Resonator-Series Mode 4.7K 10K Vdd OSCI EM78P156EL 7404 10K 7404 XTAL C1 C2 Fig. 14 Circuit for Crystal/Resonator-Parallel Mode This specification is subject to change without prior notice. 27 2002/04/19 EM78P156EL OTP ROM 3. External RC Oscillator Mode For some applications that do not need a very precise timing calculation, the RC oscillator (Fig. 15) offers a lot of cost savings. Nevertheless, it should be noted that the frequency of the RC oscillator is influenced by the supply voltage, the values of the resistor (Rext), the capacitor (Cext), and even by the operation temperature. Moreover, the frequency also changes slightly from one chip to another due to the manufacturing process variation. In order to maintain a stable system frequency, the values of the Cext should not be less than 20pF, and that the value of Rext should not be greater than 1 M ohm. If they cannot be kept in this range, the frequency is easily affected by noise, humidity, and leakage. The smaller the Rext in the RC oscillator, the faster its frequency will be. On the contrary, for very low Rext values, for instance, 1 K, the oscillator becomes unstable because the NMOS cannot discharge the current of the capacitance correctly. Based on the above reasons, it must be kept in mind that all of the supply voltage, the operation temperature, the components of the RC oscillator, the package types, the way the PCB is layout, will affect the system frequency. Vcc Rext OSCI EM78P156EL Cext Fig. 15 Circuit for External RC Oscillator Mode Table 11 RC Oscillator Frequencies Cext Rext 3.3k 5.1k 10k 100k 28 Average Fosc 5V,25C Average Fosc 3V,25C 3.92 MHz 2.67 MHz 1.39MHz 149 KHz 3.65 MHz 2.60 MHz 1.40 MHz 156 KHz 2002/04/19 20 pF This specification is subject to change without prior notice. EM78P156EL OTP ROM 100 pF 300 pF 3.3k 5.1k 10k 100k 3.3k 5.1k 10k 100k 1.39 MHz 940 KHz 480 KHz 52 KHz 595 KHz 400 KHz 200 KHz 21 KHz 1.33 MHz 920 KHz 475 KHz 50 KHz 560 KHz 390 KHz 200 KHz 20 KHz 4.8 CODE Option Register The EM78P156EL has a CODE option word that is not a part of the normal program memory. The option bits cannot be accessed during normal program execution. Code Option Register and Customer ID Register arrangement distribution: Word 0 Bit12~Bit0 Word 1 Bit12~Bit0 1. Code Option Register (Word 0) Bit12 MS Bit11 /ENWDT Bit10 CLK Bit9 CS Bit8 HLF WORD 0 Bit7 Bit6 HLP Bit5 Bit4 Bit3 Bit2 Bit1 Bit0 - * Bit 12 (MS):Oscillator type selection. 0: RC type 1: XTAL type (XTAL1 and XTAL2) * Bit 11 (/ENWDT): Watchdog timer enable bit. 0: Enable 1: Disable * Bit 10 (CLK): Instruction period option bit. 0: two oscillator periods. 1: four oscillator periods. Refer to the section on Instruction Set. * Bit 9 (CS): Code Security Bit 0: Security On 1: Security Off * Bit 8 (HLF): XTAL frequency selection 0: XTAL2 type (low frequency, 32.768KHz) This specification is subject to change without prior notice. 29 2002/04/19 EM78P156EL OTP ROM 1: XTAL1 type (high frequency) This bit will affect system oscillation only when Bit12 (MS) is "1". When MS is"0", HLF must be "0". 4.9 Power On Considerations Any microcontroller is not guaranteed to start to operate properly before the power supply stays at its steady state. EM78P156EL is equipped with Power On Voltage Detector (POVD) with a detecting level of 1.8V. It will work well if Vdd rise quick enough (50 ms or less). In many critical applications, however, extra devices are still required to assist in solving power-up problems. 4.10 External Power On Reset Circuit The circuit shown in Fig.16 implements an external RC to produce the reset pulse. The pulse width (time constant) should be kept long enough for Vdd to reached minimum operation voltage. This circuit is used when the power supply has slow rise time. Because the current leakage from the /RESET pin is about 5A, it is recommended that R should not be greater than 40 K. In this way, the /RESET pin voltage is held below 0.2V. The diode (D) acts as a short circuit at the moment of power down. T he capacitor C will discharge rapidly and fully. Rin, the current-limited resistor, will prevent high current or ESD (electrostatic discharge) from flowing to pin /RESET. This specification is subject to change without prior notice. 30 2002/04/19 EM78P156EL OTP ROM Vdd /RESET EM78P156EL Rin C R D Fig. 16 External Power-Up Reset Circuit 4.11 Residue-Voltage Protection When battery is replaced, device power (Vdd) is taken off but residue-voltage remains. The residue-voltage may trips below Vdd minimum, but not to zero. This condition may cause a poor power on reset. Fig.18 and Fig. 19 show how to build a residue-voltage protection circuit. Vdd EM78P156EL Q1 /RESET 40K 1N4684 10K 33K Vdd Fig. 17 Circuit 1 for the Residue Voltage Protection This specification is subject to change without prior notice. 31 2002/04/19 EM78P156EL OTP ROM Vdd EM78P156EL Q1 /RESET 40K R2 R1 Vdd Fig. 18 Circuit 2 for the Residue Voltage Protection 4.12 Instruction Set Each instruction in the instruction set is a 13-bit word divided into an OP code and one or more operands. Normally, all instructions are executed within one single instruction cycle (one instruction consists of 2 oscillator periods), unless the program counter is changed by instruction "MOV R2,A", "ADD R2,A", or by instructions of arithmetic or logic operation on R2 (e.g. "SUB R2,A", "BS(C) R2,6", "CLR R2", ). In this case, the execution takes two instruction cycles. If for some reasons, the specification of the instruction cycle is not suitable for certain applications, try modifying the instruction as follows: (A) Change one instruction cycle to consist of 4 oscillator periods. (B) "JMP", "CALL", "RET", "RETL", "RETI", or the conditional skip ("JBS", "JBC", "JZ", "JZA", "DJZ", "DJZA") commands which were tested to be true, are executed within two instruction cycles. The instructions that are written to the program counter also take two instruction cycles. Case (A) is selected by the CODE Option bit, called CLK. One instruction cycle consists of two oscillator clocks if CLK is low, and four oscillator clocks if CLK is high. Note that once the 4 oscillator periods within one instruction cycle is selected as in Case (A), the internal clock source to TCC should be CLK=Fosc/4, instead of Fosc/ 2 as indicated in Fig. 5. In addition, the instruction set has the following features: (1) Every bit of any register can be set, cleared, or tested directly. This specification is subject to change without prior notice. 32 2002/04/19 EM78P156EL OTP ROM (2) The I/O register can be regarded as general register. That is, the same instruction can operate on I/O register. The symbol "R" represents a register designator that specifies which one of the registers (including operational registers and general purpose registers) is to be utilized by the instruction. "b" represents a bit field designator that selects the value for the bit which is located in the register "R", and affects operation. "k" represents an 8 or 10-bit constant or literal value. INSTRUCTION BINARY 0 0000 0000 0000 0 0000 0000 0001 0 0000 0000 0010 0 0000 0000 0011 0 0000 0000 0100 0 0000 0000 rrrr 0 0000 0001 0000 0 0000 0001 0001 0 0000 0001 0010 0 0000 0001 0011 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0000 0000 0000 0000 0000 0001 0001 0001 0001 0010 0010 0010 0010 0011 0011 0011 0011 0100 0100 0100 0100 0101 0101 0101 0101 0001 0001 01rr 1000 11rr 00rr 01rr 10rr 11rr 00rr 01rr 10rr 11rr 00rr 01rr 10rr 11rr 00rr 01rr 10rr 11rr 00rr 01rr 10rr 11rr 0100 rrrr rrrr 0000 rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr HEX 0000 0001 0002 0003 0004 000r 0010 0011 0012 0013 0014 001r 00rr 0080 00rr 01rr 01rr 01rr 01rr 02rr 02rr 02rr 02rr 03rr 03rr 03rr 03rr 04rr 04rr 04rr 04rr 05rr 05rr 05rr 05rr 06rr 06rr 06rr 06rr MNEMONIC NOP DAA CONTW SLEP WDTC IOW R ENI DISI RET RETI CONTR IOR R MOV R,A CLRA CLR R SUB A,R SUB R,A DECA R DEC R OR A,R OR R,A AND A,R AND R,A XOR A,R XOR R,A ADD A,R ADD R,A MOV A,R MOV R,R COMA R COM R INCA R INC R DJZA R DJZ R RRCA R RRC R RLCA R RLC R 33 0 0110 00rr rrrr 0 0110 01rr rrrr 0 0110 10rr rrrr 0 0110 11rr rrrr OPERATION No Operation Decimal Adjust A A CONT 0 WDT, Stop oscillator 0 WDT A IOCR Enable Interrupt Disable Interrupt [Top of Stack] PC [Top of Stack] PC, Enable Interrupt CONT A IOCR A A R 0A 0R R-A A R-A R R-1 A R-1 R A R A A R R A&RA A&RR A R A A R R A+RA A+RR RA RR /R A /R R R+1 A R+1 R R-1 A, skip if zero R-1 R, skip if zero R(n) A(n-1), R(0) C, C A(7) R(n) R(n-1), R(0) C, C R(7) R(n) A(n+1), R(7) C, C A(0) R(n) R(n+1), STATUS AFFECTED None C None T,P T,P None 2002/04/19 This specification is subject to change without prior notice. EM78P156EL OTP ROM 0 0111 00rr rrrr 0 0 0 0 0 0 0 0111 0111 0111 100b 101b 110b 111b 01rr 10rr 11rr bbrr bbrr bbrr bbrr rrrr rrrr rrrr rrrr rrrr rrrr rrrr 07rr 07rr 07rr 07rr 0xxx 0xxx 0xxx 0xxx 1kkk 1kkk 18kk 19kk 1Akk 1Bkk 1Ckk 1Dkk 1E01 1Fkk SWAPA R SWAP R JZA R JZ R BC R,b BS R,b JBC R,b JBS R,b CALL k JMP k MOV A,k OR A,k AND A,k XOR A,k RETL k SUB A,k INT ADD A,k 1 00kk kkkk kkkk 1 1 1 1 1 01kk 1000 1001 1010 1011 kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk kkkk 1 1100 kkkk kkkk 1 1101 kkkk kkkk 1 1110 0000 0001 1 1111 kkkk kkkk R(7) C, C R(0) R(0-3) A(4-7), R(4-7) A(0-3) R(0-3) R(4-7) R+1 A, skip if zero R+1 R, skip if zero 0 R(b) 1 R(b) if R(b)=0, skip if R(b)=1, skip PC+1 [SP], (Page, k) PC (Page, k) PC kA A k A A&kA A k A k A, [Top of Stack] PC k-A A PC+1 [SP], 001H PC k+A A None None None None None This specification is subject to change without prior notice. 34 2002/04/19 EM78P156EL OTP ROM 4.13 Timing Diagrams AC Test Input/Output Waveform 2.4 2.0 TEST POINTS 2.0 0.8 0.8 0.4 AC Testing : Input is driven at 2.4V for logic "1",and 0.4V for logic "0".Timing measurements are made at 2.0V for logic "1",and 0.8V for logic "0". RESET Timing (CLK="0") NOP Instruction 1 Executed CLK /RESET Tdrh TCC Input Timing (CLKS="0") Tins CLK TCC Ttcc This specification is subject to change without prior notice. 35 2002/04/19 EM78P156EL OTP ROM 5. ABSOLUTE MAXIMUNM RATINGS Items Temperature under bias Storage temperature Input voltage Output voltage Rating 0C to 70C -65C to 150C -0.3V to +6.0V -0.3V to +6.0V This specification is subject to change without prior notice. 36 2002/04/19 EM78P156EL OTP ROM 6. ELECTRICAL CHARACTERISTICS 6.1 DC Electrical Characteristic ( Ta= 0C ~ 70 C, VDD= 5.0V5%, VSS= 0V ) Symbol FXT ERC IIL VIH1 VIL1 VIHT1 VILT1 VIHX1 VILX1 VIH2 VIL2 VIHT2 VILT2 VIHX2 VILX2 VOH1 VOL1 VOL2 IPH IPD ISB1 ISB2 ICC1 Parameter Condition Min Typ. XTAL: VDD to 3V Two cycle with two clocks DC XTAL: VDD to 5V Two cycle with two clocks DC R: 5.1K, C: 100 pF F30% 940 ERC: VDD to 5V Input Leakage Current for input pins VIN = VDD, VSS Input High Voltage (VDD=5V) Ports 5, 6 2.0 Input Low Voltage (VDD=5V) Ports 5, 6 Input High Threshold Voltage (VDD=5V) /RESET, TCC 2.0 Input Low Threshold Voltage (VDD=5V) /RESET, TCC Clock Input High Voltage (VDD=5V) OSCI 3.5 Clock Input Low Voltage (VDD=5V) OSCI Input High Voltage (VDD=3V) Ports 5, 6 1.5 Input Low Voltage (VDD=3V) Ports 5, 6 Input High Threshold Voltage (VDD=3V) /RESET, TCC 1.5 Input Low Threshold Voltage (VDD=3V) /RESET, TCC Clock Input High Voltage (VDD=3V) OSCI 2.1 Clock Input Low Voltage (VDD=3V) OSCI Output High Voltage IOH = -12.0 mA 2.4 (Ports 5, 6) Output Low Voltage (P60~P61) IOL = 12.0 mA Output Low Voltage IOL = 10.5 mA (Port5, P62~P67) Pull-high current Pull-high active, input pin at VSS -50 -70 Pull-down current Pull-down active, input pin at VDD 25 50 All input and I/O pins at VDD, Power down current output pin floating, WDT disabled All input and I/O pins at VDD, Power down current output pin floating, WDT enabled Operating supply current /RESET= 'High', Fosc=32KHz 15 15 (VDD=3V) (Crystal type,CLKS="0"), output at two cycles/four clocks pin floating, WDT disabled Operating supply current /RESET= 'High', Fosc=32KHz 20 (VDD=3V) (Crystal type,CLKS="0"), output at two cycles/four clocks pin floating, WDT enabled Operating supply current /RESET= 'High', Fosc=4MHz (VDD=5.0V) (Crystal type, CLKS="0"), output at two cycles/two clocks pin floating, WDT enabled Operating supply current /RESET= 'High', Fosc=10MHz (VDD=5.0V) (Crystal type, CLKS="0"), output at two cycles/four clocks pin floating, WDT enabled Max 8.0 20.0 F30% 1 0.8 0.8 1.5 0.4 0.4 0.9 Unit MHz MHz KHz A V V V V V V V V V V V V V 0.4 0.4 -240 120 1 10 30 V V A A A A A A ICC2 35 ICC3 1.6 mA ICC4 4.0 mA This specification is subject to change without prior notice. 37 2002/04/19 EM78P156EL OTP ROM 6.2 AC Electrical Characteristic (Ta=0C ~ 70 C, VDD=5V5%, VSS=0V) Symbol Dclk Tins Ttcc Tdrh Trst Twdt Tset Thold Tdelay Parameter Input CLK duty cycle Instruction cycle time (CLKS="0") TCC input period Device reset hold time /RESET pulse width Watchdog timer period Input pin setup time Input pin hold time Output pin delay time Conditions Crystal type RC type Ta = 25C Ta = 25C Ta = 25C Min 45 100 500 (Tins+20)/N* 16 2000 16 Typ 50 Max 55 DC DC 17.6 17.6 Unit % ns ns ns ms ns ms ns ns ns 16.8 16.8 0 20 50 Cload=20pF * N= selected prescaler ratio. This specification is subject to change without prior notice. 38 2002/04/19 EM78P156EL OTP ROM APPENDIX Package Types: OTP MCU EM78P156ELP EM78P156ELM EM78P156ELAS EM78P156ELKM Package Type DIP SOP SSOP SSOP Pin Count 18 18 20 20 Package Size 300 mil 300 mil 209 mil 209 mil This specification is subject to change without prior notice. 39 2002/04/19 |
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