View IA6805E2-PDW40I_1897337.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 1 of 31 1 - 888 - 824 - 4184 features form, fit, and function compatible with the harris ? cdp6805e2ce and motorola ? mc146805e2 internal 8 - bit timer with 7 - bit programmable prescaler on - chip clock memory mapped i/o versatile interrupt handling true bit manipulation bit test and branch instruction vectored interrupts power - saving stop and wait modes fully static operation 112 bytes of ram the ia6805e2 is a "plug - and - play" drop - in replacement for the original ic. innov asic produces replacement ics using its miles tm , or managed ic lifet ime extension system, cloning technology. this technology produces replacement ics far more complex than "emulation" while ensuring they are compatible with the original ic. miles tm captures the design of a clone so it can be produced even as silicon tech nology advances. miles tm also verifies the clone against the original ic so that even the "undocumented features" are duplicated. this data sheet documents all necessary engineering information about the ia6805e2 including functional and i/o descriptions , electrical characteristics, and applicable timing. package pinout a12 nc (6) as (1) reset_n (2) irq_n (3) li (4) ds (5) rw_n (7) pa7 (8) (9) pa5 (10) (11) (12) pa2 (13) pa1 (14) 40 pin dip ia6805e2 pb4 pb5 pb6 pb7 (20) vss (15) a12 (16) a11 (17) a10 (18) a9 (19) a8 (21) (22) (23) (24) b6 b7 (40) (39) (38) (37) (36) (35) (34) (33) (32) (31) (30) (29) (28) (27) (26) (25) pa0 b4 b5 b2 b3 b0 b1 pb2 pb3 pb0 pb1 osc2 timer vdd osc1 pa6 pa4 pa3 rw_n nc b2 44 pin lcc ia6805e2 (12) pa3 (7) as (8) pa7 (9) pa6 (10) pa5 (11) pa4 (13) pa2 (14) pa1 (15) pa0 (16) nc (17) nc pb1 pb7 pb6 pb5 pb3 pb2 a10 a11 (6) (5) (4) (3) (2) (1) (44) (43) (42) osc2 (41) timer (40) pb0 (34) (39) (38) (37) (36) (35) (33) (32) (31) (30) (29) (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) (28) vdd osc1 irq_n reset_n ds li a8 a9 b7 vss b5 b6 b4 b3 b1 b0 pb4
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 2 of 31 1 - 888 - 824 - 4184 description the ia6805e2 (cmos) microprocessor unit (mpu) is a low cost, low power mpu. it features a cpu, on - chip ram, parallel i/o compatibility with pins programmable as input or output. the following paragraphs will further describe this system block diagram and design in more detail. program counter low 112x8 ram address drive mux bus drive cpu port a reg oscillator data dir reg port b reg data dir reg cpu control alu bus control stack pointer condition code register index register accumulator program counter high timer control prescaler timer/ counter pa0 pa7 pa6 pa5 pa4 pa3 pa2 pa1 pb0 pb7 pb6 pb5 pb4 pb3 pb2 pb1 pa0 osc1 osc2 timer reset_n li irq_n b0 b7 b6 b5 b4 b3 b2 b1 a8 a12 a11 a10 a9 rw_n ds as 8 a 5 6 5 8 8 x cc sp pch pcl port a i/o lines port b i/o lines multiplexed address data bus address bus address strobe data strobe read/write figure 1. system block diagram
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 3 of 31 1 - 888 - 824 - 4184 table 1 i/o signal description the table below describes the i/o characteristics for each signal on the ic. the signal names correspond t o the signal names on the pinout diagrams provided. signal name i/o description v dd and v ss (power and ground) n/a source: these two pins provide power to the chip. v dd provides +5 volts (0.5) power and v ss is ground. reset_n (reset) i ttl: input pin that can be used to reset the mpu's internal state by pulling the reset_n pin low. irq_n (interrupt request) i ttl: input pin that is level and edge sensitive. can be used to request an interrupt sequence. li (load instruction) o ttl with slew rate control: output pin used to indicate that a next opcode fetch is in progress. used only for certain debugging and test systems. not connected in normal operation. overlaps data strobe (ds) signal. this output is capable of driving one standard ttl load and 50pf. ds (data strobe) o ttl with slew rate control: output pin used to transfer data to or from a peripheral or memory. ds occurs anytime the mpu does a data read or write and during data transfer to or from internal memory. ds is available at f osc ? 5 when the mpu is not in the wait or stop mode. this output is capable of driving one standard ttl load and 130pf. rw_n (read/write) o ttl with slew rate control: output pin used to indicate the direction of data transfer from internal memory, i/o registers, and external peripheral devices and memories. indicates to a selected peripheral whether the mpu is to read (rw_n high) or write (rw_n low) data on the next data strobe. this output is capable of driving one standard ttl load and 130pf. as (address strobe) o ttl with slew rate control: output strobe used to indicate the presence of an address on the 8-bit multiplexed bus. the as line is used to demultiplex the eight least significant address bits from the data bus. as is available at f osc ? 5 when the mpu is not in the wait or stop modes. this output is capable of driving one standard ttl load and 130pf. pa0-pa7/pb0-pb7 (input/output lines) i/o ttl with slew rate control: these 16 lines constitute input/output ports a and b. each line is individually programmed to be either an input or output under software control of the data direction register (ddr) as shown below in table 1 and figure 2 . the port i/o is programmed by writing the corresponding bit in the ddr to a "1" for output and a "0" for input. in the output mode the bits are latched and appear on the corresponding output pins. all the ddr's are initialized to a "0" on reset. the output port registers are not initialized on reset. each output is capable of driving one standard ttl load and 50pf. a8-a12 (high order address lines) o ttl with slew rate control: these five outputs constitute the higher order non- multiplexed address lines. each output is capable of driving one standard ttl load and 130pf. b0-b7 (address/data bus) i/o ttl with slew rate control: these bi-directional lines constitute the lower order addresses and data. these lines are multiplexed with address present at address strobe time and data present at data strobe time. when in the data mode, these lines are bi- directional, transferring data to and from memory and peripheral devices as indicated by the rw_n pin. as outputs, these lines are capable of driving one standard ttl load and 130pf. timer i ttl: input used to control the internal timer/counter circuitry. osc1, osc2 (system clock) ttl oscillator input/output: these pins provide control input for the on-chip clock oscillator circuits. either a crystal or external clock is connected to these pins to provide a system clock. the crystal connection is shown in figure 3 . the osc1 to bus transitions for system designs using oscillators slower than 5mhz is shown in figure 4 . crystal the circuit shown in figure 3 is recommended when using a crystal. an external cmos oscillator is recommended when using crystals outside the specified ranges. to minimize output distortion and start-up stabilization time, the crystal and components should be mounted as close to the input pins as possible. external clock when an external clock is used, it should be applied to the osc1 input with the osc2 input not connected, as shown in figure 3 . i/o
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 4 of 31 1 - 888 - 824 - 4184 i/o port circuitry and register configuration: i/o pin functions r/w-n ddr i/o pin functions 0 0 the i/o pin is in input mode. data is written into the output data latch. 0 1 data is written into the output data latch and output to the i/o pin. 1 0 the state of the i/o pin is read. 1 1 the i/o pin is in an output mode. the output data latch is read. data direction register bit i/o pin output latched output data bit input reg bit input i/o pin to and from cpu dda7 (ddb7) dda1 (ddb1) dda2 (ddb2) dda3 (ddb3) dda4 (ddb4) dda5 (ddb5) dda6 (ddb6) dda0 (ddb0) data direction a(b) register port a(b) register 7 4 5 6 3 0 1 2 pa7 (pb7) pa6 (pb6) pa5 (pb5) pa4 (pb4) pa3 (pb3) pa2 (pb2) pa1 (pb1) pa0 (pb0) pin $0004 ($0005) $0000 ($0001) figure 2. pa0 - pa7/pb0 - pb7 (input/output lines)
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 5 of 31 1 - 888 - 824 - 4184 crystal parameters representative frequencies: oscillator connections: osc1 to bus transitions timing waveforms: 5.0 mhz 4.0 mhz 1.0 mhz r s max 50 w 75 w 400 w c0 8 pf 7 pf 5 pf c1 0.02 pf 0.012 pf 0.008 pf q 50 k 40 k 30 k c osc1 15-30 pf 15-30 pf 15-40 pf c osc2 15-25 pf 15-25 pf 15-30 pf l c1 39 c0 rs osc1 osc2 38 39 osc2 38 osc1 crystal circuit crystal oscillator connections t ol t t oh t olol osc1 pin ia6805e2 10 m w c osc2 osc1 osc1 c osc2 38 39 osc1 ia6805e2 osc2 38 39 nc osc1 as ds rw_n a[12:8] b[7:0] mpu read b[7:0] mpu write *read data "latched" on ds fall mux addr mpu read data* mux addr mpu write data figure 3. osc1, osc2 (system clock) figure 4. osc1, osc2 (system clock)
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 6 of 31 1 - 888 - 824 - 4184 function al description memory: the mpu is capable of addressing 8192 bytes of memory and i/o registers. the locations are divided into internal memory space and external memory space as shown in figure 5. the first 128 bytes of memory contain internal port i/o l ocations, timer locations, and 112 bytes of ram. the mpu can read from or write to any of these locations. during program reads from on chip locations, the mpu accepts data only from the addressed on chip location. any read data appearing on the input bus is ignored. the shared stack area is used during interrupts or subroutine calls. a maximum of 64 bytes of ram is available for stack usage. the stack pointer is set to $7f at power up. the unused bytes of the stack can be used for data storage or temporary work locations, but care must be taken to prevent it from being overwritten due to stacking from an interrupt or subroutine call. ram (112 bytes) i/o ports timer ram external memory space (8064 bytes) timer interrupt from wait state only timer interrupt external interrupt swi reset port a data register port b data register external memory space external memory space port a data direction register port b data direction register external memory space external memory space timer data register timer control register external memory space $1ff6 - $1ff7 $1ff8 - $1ff9 $1ffa - $1ffb $1ffc - $1ffd $1ffe - $1fff $0000 $007f $0080 $00ff $0100 63 64 127 0 127 128 255 256 8191 interrupt vectors access via page 0 direct address stack (64 bytes max) 0 1 2 3 4 5 6 7 8 9 10 15 16 figure 5. memory map
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 7 of 31 1 - 888 - 824 - 4184 registers: the following paragraphs describe the registers contained in the mpu. figure 6 shows the programming model an d figure 7 shows the interrupt stacking order. note: since the stack pointer decrements during pushes, the pcl is stacked first, followed by pch, etc. pulling from the stack is in the reverse order. condition code register accumulator index register 1 1 1 i n t e r r u p t decreasing memory addresses stack pch 0 0 0 pcl r e t u r n increasing memory addresses unstack a x sp 1 0 0 0 0 0 0 h i n z c 7 0 cc condition code register carry/borrow half carry interrupt mask negative zero stack pointer program counter index register accumulator 7 0 12 0 7 8 pch pcl 12 6 0 4 0 figure 6. programming model figure 7. interrupt stacking order
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 8 of 31 1 - 888 - 824 - 4184 a(accumulator): the accumulator is an 8 - bit register used to hold operands and results of arithmetic calculations or data manipulations. x(index register): the index register is an 8 - bit register used during the indexed addressing mode. it contains an 8 - bit value used to create an effective addres s. the index register may also be used as a temporary storage area when not performing addressing operations. pc(program counter): the program counter is a 13 - bit register that holds the address of the next instruction to be performed by the mpu. sp(stack pointer): the stack pointer is a 13 - bit register that holds the address of the next free location on the stack. during an mpu reset or the reset stack pointer (rsp) instruction, the stack pointer is set to location $007f. the seven most significant bits o f the stack pointer are permanently set to 0000001. they are appended to the six least significant register bits to produce an address range down to location $0040. the stack pointer gets decremented as data is pushed onto the stack and incremented as data is removed from the stack. the stack area of ram is used to store the return address on subroutine calls and the machine state during interrupts. the maximum number of locations for the stack pointer is 64 bytes. if the stack goes beyond this limit the st ack pointer wraps around and points to its upper limit thereby losing the previously stored information. subroutine calls use 2 bytes of ram on the stack and interrupts use 5 bytes. cc(condition code register): the condition code register is a 5 - bit regist er that indicates the results of the instruction just executed. the bit is set if it is high. a program can individually test these bits and specific actions can be taken as a result of their states. following is an explanation of each bit. c(carry bit): the carry bit indicates that a carry or borrow out of the arithmetic logical unit (alu) occurred during the last arithmetic instruction. this bit is also modified during bit test, shift, rotate, and branch types of instructions. z(zero bit): the zero bit indicates the result of the last arithmetic, logical, or data manipulation was zero . n(negative bit): the negative bit indicates the result to the last arithmetic, logical, or data manipulation was negative (bit 7 in the result is high).
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 9 of 31 1 - 888 - 824 - 4184 i(interrupt m ask bit) the interrupt mask bit indicates that both the external interrupt and the timer interrupt are disabled (masked). if an interrupt occurs while this bit is set, the interrupt is latched and is processed as soon as the interrupt bit is cleared. h(hal f carry bit) the half carry bit indicates that a carry occurred between bits 3 and 4 of the alu during an add or adc operation. resets: the mpu can be reset by initial power up or by the external reset pin (reset_n). por(power on reset) power on reset occurs on initial power up. it is strictly for power initialization conditions and should not be used to detect drops in the power supply voltage. there is a 1920 t cyc time out delay from the time the oscillator is detected. if the reset_n pin is still low at the end of the delay, the mpu will remain in the reset state until the external pin goes high. reset_n the reset_n pin is used to reset the mpu. the reset pin must stay low for a minimum of t cyc to guarantee a reset. the reset_n pin is provided with a schmitt trigger to improve noise immunity capability. interrupts: the mpu can be interrupted with the external interrupt pin (irq_n), the internal timer interrupt request, or the software interrupt instruction. when any of these interrupts occur, normal processing is suspended at the end of the current instruction execution. the processor registers are saved on the stack (stacking order shown in figure 7) and the interrupt mask (i) is set to prevent additional interrupts. normal processing resumes after the rti instruction causes the register contents to be recovered from the stack. when the current instruction is completed, the processor checks all pending hardware interrupts and if unmasked (i bit clear) proceeds with interrupt processing. otherwise, th e next instruction is fetched and executed. masked interrupts are latched for later interrupt service. external interrupts hold higher priority than timer interrupts. at the end of an instruction execution, if both an external interrupt and timer interrupt are pending, the external interrupt is serviced first. the swi gets executed with the same priority as any other instruction if the hardware interrupts are masked (i bit set). figure 8 shows the reset and interrupt processing flowchart.
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 10 of 31 1 - 888 - 824 - 4184 i_cc <= 1 sp <= $007f ddrs <= 0 clr irq_n logic timer <= $ff prescaler <= $7f tcr <= $7f fetch instruction put 1ffe,1fff on address bus reset load pc from 1ffe/1fff execute all instruction cycles clear irq_n request latch load pc from: swi: 1ffc/1ffd irq_n: 1ffa/1ffb timer: 1ff8/1ff9 timer wait:1ff6/ 1ff7 i <= 1 stack pc, x, a, cc pc+1=>pc in reset ? i bit ? irq_n edge ? is fetched instruction an swi? tcr6=0 and tcr7=1? reset_n pin = low reset_n pin = low swi timer irq_n y y y y n n n n set clear figure 8. reset and interrupt processing flowchart
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 11 of 31 1 - 888 - 824 - 4184 external i nterrupt: if the external interrupt pin irq_n is ?low? and the interrupt mask bit of the condition code register is cleared, the external interrupt occurs. when the interrupt is recognized, the current state of the machine is pushed onto the stack and the condition code register i - bit gets set masking further interrupts until the present one is serviced. the program counter is then loaded with the contents of the interrupt vector, which contains the location of the interrupt service routine. the contents o f $1ffa and $1ffb specify the address for this service routine. a functional diagram of the external interrupt is shown in figure 9 and a mode diagram of the external interrupt is shown in figure 10. the timing diagram shows two different treatments of the interrupt line (irq_n) to the processor. the first shows several interrupt lines ?wire ored? to form the interrupts at the processor. if the interrupt line (irq_n) remains low after servicing an interrupt, the next interrupt is recognized. the second show s single pulses on the interrupt line spaced far enough apart to be serviced. the minimum time between pulses is a function of the length of the interrupt service. after a pulse occurs, the next pulse should not occur until an rti has occurred. the time be tween pulses (t ilil ) is obtained by adding 20 instruction cycles to the total number of cycles it takes to complete the service routine including the rti instruction. d c q q r v dd interrupt pin power-on reset external interrupt being serviced external reset i bit (ccr) external interupt request figure 9. interrupt functional diagram
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 12 of 31 1 - 888 - 824 - 4184 figure 10. interrupt mode diagram timer interrupt: if the timer mask bit (tcr6) and the interrupt mask bi t (i) of the condition code register are cleared, each time the timer decrements to zero ($01 to $00 transition) an interrupt request is generated. when the interrupt is recognized, the current state of the machine is pushed onto the stack and the conditio n code register i - bit gets set masking further interrupts until the present one is serviced. the program counter is then loaded with the contents of the timer interrupt vector, which contains the location of the timer interrupt service routine. the content s of $1ff8 and $1ff9 specify the address for this service routine. if the mpu is in the wait mode and a timer interrupt occurs, then the contents of $1ff6 and $1ff7 specify the service routine. when the timer interrupt service routine is complete, the soft ware executes an rti instruction to restore the machine state and starts executing the interrupt program. software interrupt: software interrupt is an executable instruction regardless of the state of the interrupt mask bit (i) in the condition code regis ter. swi is similar to hardware interrupts. it executes after the other interrupts if the interrupt mask bit is zero. the contents of $1ffc and $1ffd specify the address for this service routine . low power modes: the low power modes consist of the stop ins truction and the wait instruction. the following paragraphs explain these modes of operation.
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 13 of 31 1 - 888 - 824 - 4184 figure 11. stop function flowchart stop modes: the stop instruction places the mpu in low power consumption mode. the stop instruction disables clocking of most internal registers. timer control register bits 6 and 7 (tcr6 and tcr7) are altered to remove any pending timer interrupt requests and to disable any further timer interrupts. the ds and as output lines go ?low? and the rw_n line goes ?high?. the multiplexed address/data bus goes to the d ata input state. the high order address lines remain at the address of the next instruction. external interrupts are enabled by clearing the i bit in the condition code register. all other registers, memory, and i/o remain unaltered. only an external inte rrupt or reset will bring the mpu out of the stop mode. figure 11 shows a flowchart of the stop function. tcr bit 7 <= 0 tcr bit 6 <= 1 clear i bit fetch external interrupt or reset vector stop external interrupt? reset? y n n y
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 14 of 31 1 - 888 - 824 - 4184 figure 1 2. wait function flowchart wait mode: the wait instruction places the mpu in low power consumption mode. the wait instruction disables clocking of most internal register s. the ds and as output lines go ?low? and the rw_n line goes ?high?. the multiplexed address/data bus goes to the data input state. the high order address lines remain at the address of the next instruction. external interrupts are enabled by clearing th e i bit in the condition code register. all other registers, memory, and i/o remain unaltered. only an external interrupt, timer interrupt, or reset will bring the mpu out of the wait mode. the timer may be enabled to allow a periodic exit from the wait mo de. if an external and a timer interrupt occur at the same time, the external interrupt is serviced first. then, if the timer interrupt request is not cleared in the external interrupt routine, the normal timer interrupt (not the timer wait interrupt) is s erviced since the mpu is no longer in the wait mode. figure 12 shows a flowchart of the wait function. oscillator active, clear i bit, timer clock active, fetch external interrupt, reset, or timer interrupt (from wait mode only) wait external interrupt? reset? y n n y timer interrupt? (tcr bit7 = 1) tcr bit 6 = 0? n y n y
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 15 of 31 1 - 888 - 824 - 4184 figure 13. timer block diagram timer: the mpu contains a single 8 - bit software programmable counter driven by a 7 - bit software programmable prescaler. the counter may be loaded under program control and decrements to zero. when the counter decrements to zero, the timer interrupt request bit in the timer control register (tcr7) is set. figure 13 shows a block diagram of the timer. if the timer mask bit (tcr6) and the interrupt mas k bit (i) of the condition code register are cleared, an interrupt request is generated. after completion of the current instruction, the current state of the machine is pushed onto the stack. the timer interrupt vector address is then fetched from locatio ns $1ff8 and $1ff9 and the interrupt routine is executed, unless the mpu was in the wait mode in which case the interrupt vector address in locations $1ff6 and $1ff7 is fetched. power - on - reset causes the counter to set to $ff. note: 1. prescaler and cou nter are clocked on the falling edge of the internal clock (as) or external input. 2. counter is written to during data strobe (ds) and counts down continuously. timer (pin 37) tcr4 tcr5 tcr3 tcr2 tcr1 tcr0 2 - to - 1 mux prescaler (7 bits) counter (8 bits) interrupt control write read int clk ext clk interrupt internal_n / external internal clock enable / disable_n timer_n setting tcr3 clears prescaler to 1 software functions
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 16 of 31 1 - 888 - 824 - 4184 the counter continues to count past zero, falling from $00 to $ff, and continues. th e processor may read the counter at any time without disturbing the count by reading the timer data register (tdr). this allows a program to determine the length of time since a timer interrupt has occurred. the timer interrupt request bit remains set unti l cleared by software. the interrupt is lost if this happens before the timer interrupt is serviced. the prescaler is a 7 - bit divider used to extend the maximum length of the timer. tcr bits 0 - 2 are programmed to choose the appropriate prescaler output, which is used as the count input. the prescaler is cleared by writing a ?1? into tcr bit 3, which avoids truncation errors. the processor cannot write to or read from the prescaler. timer input mode 1: when tcr4 = 0 and tcr5 = 0, the input to the timer i s from an internal clock and the timer input is disabled. the internal clock mode can be used for periodic interrupt generation as well as a reference for frequency and event measurement. the internal clock is the instruction cycle clock and is coincident with address strobe (as) except during the wait instruction where it goes low. during the wait instruction the internal clock to the timer continues to run at its normal rate . timer input mode 2: when tcr4 = 1 and tcr5 = 0, the internal clock and timer in put signal are anded to form the timer input. this mode can be used to measure external pulse widths. the external pulse turns on the internal clock for the duration of the pulse. the count accuracy in this mode is 1 clock. accuracy improves with longer i nput pulse widths. timer input mode 3: when tcr4 = 0 and tcr5 = 1, all inputs to the timer are disabled. timer input mode 4: when tcr4 = 1 and tcr5 = 1, the internal clock input to the timer is disabled and the timer input then comes from the external ti mer pin. the external clock can be used to count external events as well as to provide an external frequency for generating periodic interrupts.
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 17 of 31 1 - 888 - 824 - 4184 tcr (timer control register ($0009)): an 8 - bit register that controls functions such as configuring operatio n mode, setting ratio of the prescaler, and generating timer interrupt request signals. all bits except bit 3 are read/write. bits tcr5 - tcr0 are unaffected by reset_n. tcr7 ? timer interrupt request used to indicate the timer interrupt when it is logic one. 1 ? set when the counter decrements to zero or under program control. 0 ? cleared on external reset, por, stop instruction, or program control . tcr6 ? timer interrupt mask used to inhibit the timer interrupt. 1 ? interrupt inhibited. set on exter nal reset, por, stop instruction, or program control. 0 ? interrupt enabled. tcr5 ? external or internal selects input clock source. unaffected by reset. 1 ? external clock selected. 0 ? internal clock selected (as) (f osc /5). tcr4 ? timer external enabl e used to enable external timer pin or to enable the internal clock. unaffected by reset. 1 ? enables external timer pin. 0 ? disables external timer pin. 7 6 5 4 3 2 1 0 tcr7 tcr6 tcr5 tcr4 tcr3 tcr2 tcr1 tcr0 reset: 0 1 0 0 0 0 0 0
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 18 of 31 1 - 888 - 824 - 4184 tcr3 ? prescaler clear write only bit. writing a ?1? to this bit resets the prescaler to zero. a read of this location always indicates a zero. unaffected by reset. tcr2 , tcr1 , tcr0 ? prescaler select bits decoded to select one of eight outputs of the prescaler. unaffected by reset. trc2 trc1 trc0 reset 0 0 0 ? 1 0 0 1 ? 2 0 1 0 ? 4 0 1 1 ? 8 1 0 0 ? 16 1 0 1 ? 32 1 1 0 ? 64 1 1 1 ? 128 prescaler
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 19 of 31 1 - 888 - 824 - 4184 instruction set description the mpu has 61 basic instruc tions divided into 5 types. the 5 types are register/memory, read - modify - write, branch, bit manipulation, and control. register/memory instructions: most of the following instructions use two operands. one is either the accumulator or the index register a nd the other is obtained from memory. the jump unconditional (jmp) and jump to subroutine (jsr) instructions have no register operand. read - modify - write instructions: these instructions read a memory or register location, modify or test its contents and then write the modified value back to memory or the register. function mnemonic load a from memory lda load x from memory ldx store a in memory sta store x in memory stx add memory to a add add memory and carry to a adc subtract memory sub subtract memory from a with borrow sbc and memory to a and or memory with a ora exclusive or memory with a eor arithmetic compare a with memory cmp arithmetic compare x with memory cpx bit test memory with a (logical compare) bit jump unconditional jmp jump to subroutine jsr function mnemonic increment inc decrement dec clear clr complement com negate (2's complement) neg rotate left thru carry rol rotate right thru carry ror logical shift left lsl logical shift right lsr arithmetic shift right asr test for negative or zero tst
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 20 of 31 1 - 888 - 824 - 4184 bit manipulation instructions: the mpu is capable of altering any bits residing in the first 256 bytes of memory. an additional feature allows the software to test and branch on the state of any bit within these locations. for test and branch instructions the value of the bit tested is placed in the carry bit of the condition code register. function mnemonic n = 0?7 branch if bit n set brset n branch if bit n clear brclr n set bit n bset n clear bit n bclr n branch instructions: if a specific condition is met, the instruction bra nches. if not, no operation is performed. function mnemonic branch always bra branch never brn branch if higher bhi branch if lower or same bls branch if carry clear bcc branch if higher or same bhs branch if carry set bcs branch if lower blo branch if not equal bne branch if equal beq branch if half carry clear bhcc branch if half carry set bhcs branch if plus bpl branch if minus bmi branch if interrupt mask bit clear bmc branch if interrupt mask bit set bms branch if interrupt line low bil branch if interrupt line high bih branch to subroutine bsr
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 21 of 31 1 - 888 - 824 - 4184 control instructions: used to control processor operation during program execution. they are register reference instructions. function mnemonic transfer a to x tax transfer x to a txa set carry bit sec clear carry bit clc set interrupt mask bit sei clear interrupt mask bit cli software interrupt swi return from subroutine rts return from interrupt rti reset stack pointer rsp no-operation nop stop stop wait wait
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 22 of 31 1 - 888 - 824 - 4184 opcode map summary: the following table is an opcode map for the instructions used on the mpu. the legend following the table shows how to use the table. abbreviations for address modes: inh inherent a accumulator x index register imm immediate dir direct ext extended rel relative bsc bit set/clear bt b bit test and branch ix indexed, no offset ix1 indexed, 1 byte offset ix2 indexed, 2 byte offset legend: hi hi low low 5 5 3 5 3 3 6 5 9 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 6 2 3 4 5 4 3 3 btb 2 bsc 2 rel 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 10 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 4 5 6 5 4 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 2 3 4 5 4 3 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 2 2 3 4 5 4 3 3 btb 2 bsc 2 rel 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 2 3 4 3 2 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 4 3 3 6 4 2 6 5 6 7 6 5 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 2 2 3 4 5 4 3 3 btb 2 bsc 2 rel 1 inh 2 imm 2 dir 3 ext 3 ix2 2 ix1 1 ix 5 5 3 5 3 3 6 5 2 2 4 5 6 5 4 3 btb 2 bsc 2 rel 2 dir 1 inh 1 inh 2 ix1 1 ix 1 inh 1 inh 2 dir 3 ext 3 ix2 2 ix1 1 ix ix1 ix2 ix branch read-modify-write control register/memory inh imm dir ext f 1111 btb bsc rel dir inh inh ix1 ix inh ror lsr 8 1000 7 0111 cmp cmp and lda cmp sbc cpx and cmp cmp cmp sbc sbc sbc sbc e 1110 f 1111 c 1100 d 1101 1010 a b 1011 9 1001 bit manipulation rts 5 0101 6 0110 0 0000 brset0 nega 2 0010 3 0011 4 0100 0 0000 bset0 bra neg negx neg neg rti sub sub sub sub sub sub brclr0 bclr0 brn 0 0000 1 0001 2 0010 brset1 bset1 bhi sbc swi 3 0011 cpx cpx cpx cpx 4 0100 5 0101 coma comx com com cpx bit bit eor brclr1 bclr1 bls com bit lda lsra and and and and lsr brset2 bset2 bcc lsr lsrx bit brclr2 bclr2 bcs a 1010 9 1001 7 0111 6 0110 8 1000 bit bit eor eor rora rorx ror lda brset3 bset3 bne ror d 1101 lda lda lda sta sta sta eor c 1100 b 1011 e 1110 brclr3 bclr3 beq asr asra asrx asr asr tax sta sta brset4 bset4 bhcc lsl lsla lslx lsl lsl clc eor eor brclr4 bclr4 bhcs rol rola rolx rol rol sec adc adc adc adc adc adc brset5 bset5 bpl dec deca decx dec dec cli ora ora ora ora ora ora brclr5 bclr5 bmi sei add add add add add add brset6 bset6 bmc inc inca incx inc inc rsp jmp jmp jmp jmp jmp brclr6 bclr6 bms tst tsta tstx tst tst nop bsr jsr jsr jsr jsr jsr brset7 bset7 bil stop ldx ldx ldx ldx ldx ldx brclr7 bclr7 bih clr clra clrx clr clr wait txa stx stx stx stx stx 6 0110 7 0111 8 1000 1 0001 2 0010 3 0011 4 0100 d 1101 e 1110 f 1111 1 0001 9 1001 a 1010 b 1011 c 1100 5 0101 sub 3 ix 1 f 1111 0 0000 opcode in hexadecimal opcode in binary address mode mnemonic bytes # of cycles
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 23 of 31 1 - 888 - 824 - 4184 ac/dc parameters absolute maximum ratings: supply voltage (v dd )........................?.?...????.?.??? - 0.3v to 6v input pin volt age (v in )?????????????... - 0.3 to v dd +0.3v operating temperature????????????.??.... - 40 c to 85 c storage temperature range (tstg).................?........?.?...? - 55c to 150c esd protection (hbm)??????????????????5000v note: the specifications indicate levels where permanent damage to the device may occur. functional operation is not guaranteed under these conditions. operation at absolute maximum conditions for extended periods may adversely affect the long - term reliability of the device. dc characteri stics (v dd =4.5 to 5.5 vdc, v ss =0, t a =t l to t h ), unless otherwise specified symbol parameter min max unit v dd supply voltage 4.5 5.5 v v ol - 0.4 v v oh 3.5 - v i ol - 2 ma i oh - -2 ma v ih high level input voltage 2 - v v il low level input voltage - 0.8 v i ih high level input current - 1 a i il low level input current - -1 a vt- schmitt negative threshold 1.1 - v vt+ schmitt positive threshold - 1.87 v frequency of operation f osc crystal - 5 mhz f osc external clock dc 5 mhz dc characteristics output current output voltage, i load 2 ma
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 24 of 31 1 - 888 - 824 - 4184 control timing v ss =0v, t a =t l to t h v dd = 5.0v 10% f osc = 5mhz parameters sym min typ max unit i/o port timing ? input setup time (figure 14) t pvasl 196 - - ns input hold time (figure 14) t aslpx 0 - - ns output delay time (figure 14) t aslpv - - 0 ns interrupt setup time (figure 15) t ilasl 0.4 - - m s crystal oscillator startup time (figure 16) t oxov - 5 100 ms wait recovery startup time (figure 17) t ivash - - 2 m s stop recovery startup time (figure 18) t ilash - - 2 m s required interrupt release (figure 15) t dslih - - 1.0 m s timer pulse width (figure 17) t th , t tl 0.5 - - t cyc reset pulse width (figure 16) t rl 1.05 - - m s timer perio d (figure 17) t tltl 1.0 - - t cyc interrupt pulse width low (figure10) t ilih 1.0 - - t cyc interrupt pulse period (figure 10) t ilil * - - t cyc oscillator cycle period (1/5 of t cyc ) (figure 3) t olol 200 - - ns osc1 pulse width high (figure 3) t oh 75 - - ns osc1 pulse width low (figure 3) t ol 75 - - ns *the minimum period of t ilil should not be less than the number of t cyc cycles it takes to execute the interrupt service routine plus 20 t cyc cycles.
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 25 of 31 1 - 888 - 824 - 4184 bus timing v ss =0v, t a =t l to t h (figure 19) num v dd = 5.0v 10% f osc = 5mhz 1 ttl, 100pf load unit parameters min max 1 cycle time 1000 dc ns 2 pulse width, ds low 587 - ns 3 pulse width, ds high 403 - ns 4 clock transition - 4 ns 8 rw_n 9 - ns 9 non - muxed address hold 97 - ns 11 rw_n d elay from ds fall - 40 ns 16 non - muxed address delay from as rise - 11 ns 17 mpu read data setup 18 - ns 18 read data hold 0 ns 19 mpu data delay, write - 0 ns 21 write data hold 204 - ns 23 muxed address delay from as rise - 26 ns 24 muxed address valid to as fall 185 - ns 25 muxed address hold 103 - ns 26 delay ds fall to as rise 190 - ns 27 pulse width, as high 203 - ns 28 delay, as fall to ds rise 185 - ns v low = 0.8v, v high = v dd ? 2.0v, v dd = 5.0v 10% t a = t l to t h , c l on port = 50pf , f osc = 5mhz *note: the address strobe of the first cycle of the next instruction. address_strobe port_input port_output t pvasl t aslpx t aslpv *note figure 14. i/o port timing
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 26 of 31 1 - 888 - 824 - 4184 note: t dslih - the interrupting device must release the irq_n line within this time to prevent subsequent recognition of the same interrupt. as ds add_bus_ unmux[8:12] irq_n__tcr7_n mux_add_ data[0:7] rw_n 1f (ff) 1f (ff) sp pcl sp-1 pch sp-2 x sp-3 a sp-4 cc new pch new pcl 80 n0 n1 n3 n2 n4 n5 n6 n7 n8 n9 t ilasl t dslih next op code address int routine starting address int routine last address fa (irq) f8 (timer) fb (irq) f9 (timer) 1st op int routine rti op code (note) next op code figure 15. irq_n and tcr 7 _n interrupt timing figure 16. power - on - reset and reset_n timing
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 27 of 31 1 - 888 - 824 - 4184 int_ext_clk tcr7 as ds a[12:8] b[7:0] rw_n op code addr address + 1 1f (ff) 1f (ff) 8f sp pcl sp-1 pch sp-2 x sp-3 a sp-4 cc f6 new pch f7 new pcl t th t tl t ivash n1 n2 n3 n4 n5 n6 n7 n0 t tltl timer counter=$00 1st op code int routine int routine starting address op code address addr + 1 wait op code int_ext_clk tcrb7 as ds a[12:8] b[7:0] rw_n op code addr address + 1 1f (ff) 1f (ff) 8e sp pcl sp-1 pch sp-2 x sp-3 a sp-4 cc f6 new pch f7 new pcl t th t tl t ivash n1 n2 n3 n4 n5 n6 n7 n0 t tltl timer counter=$00 1st op code int routine int routine starting address op code address addr + 1 stop op code figure 17. timer interrupt after wait instruction timing figure 18. interru pt recovery from stop instruction timing
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 28 of 31 1 - 888 - 824 - 4184 1 2 3 4 4 8 8 9 9 11 16 valid addr valid addr valid write data valid read data 17 11 18 18 19 21 23 24 25 25 26 27 28 as ds rw_n a[12:8] b[7:0] write b[7:0] read 4 4 4 4 26 23 21 23 figure 19. bus timing
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 29 of 31 1 - 888 - 824 - 4184 packaging information pdip packaging lead 1 identifier 1 lead count direction e1 e top ea eb c side view (width) lead count 40 (in inches) symbol min max a - .200 a1 .015 - b .015 .020 b1 .040 .060 c .008 .012 d 1.980 2.065 e .580 .610 e1 .520 .560 e .100 typ ea .580 - eb - .686 l .100 min d l a1 a b b1 e side view (length)
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 30 of 31 1 - 888 - 824 - 4184 plcc packaging lead count 44 (in millimeters) symbol min max a 4.20 4.57 a1 2.29 3.04 d1 16.51 16.66 d2 14.99 16.00 d3 12.70 bsc e1 16.51 16.66 e2 14.99 16.00 e3 12.70 bsc e 1.27 bsc d 17.40 17.67 e 17.40 17.65 .10 .51 min. r 1.14 / .64 seating plane a1 e .81 / .66 a .53 / .33 d2 / e2 side view d d1 e e1 bottom view d3 e3 pin 1 identifier & zone 1.22/1.07 2 plcs top view
ia6805e2 data sheet microprocessor unit as of production version 00 copyright ? 2002 eng21108140100 www.innovasic.com innov asic customer support: ? the end of obsolescence ? page 31 of 31 1 - 888 - 824 - 4184 ordering information the ia6805e2 is available in two package styles listed in the table below. other packages and temperature grades may be available for additional cost and lead time. package type temperature grade order number 40 lead plastic dip, 600 mil wide industrial ia6805e2 - pdw40i 44 lead plastic leaded chip carrier industrial ia6805e2 - plc44i cross reference to original manufacturers innovasic part number motoro la part number harris part number ia6805e2 - pdw40i q mc146805e2cp q cdp6805e2ce q mc146805e2p q cdp6805e2e ia6805e2 - plc44i q mc146805e2cfn q cdp6805e2cq q mc146805e2fn q cdp6805e2q errata production version 00 1. functional differences between ia6805e2 and har ris and motorola versions: stop mode on ia6805e2 will not halt oscillator. recovery from stop will be quicker. 2. observations: a. original data sheets for motorola and harris are inconsistent when describing timer input mode 2. original parts and innova sic will and together the timer input with the inverse of the internal clock (as). b. original harris part would unpredictably ?pre - increment? timer counter when writing to timer registers. ia6805e2 will not. c. original harris part displays incorrect a ddress on external pins during intermediate cycles (not a functional problem) of multi - cycle instructions when accessing memory at page boundaries. ia6805e2 will not. d. execution of illegal op - codes on the ia6805e2 will force a system reset. on the ori ginal harris and motorola parts, execution of illegal op - codes would produce unpredictable results.

▲Up To Search▲

Price & Availability of IA6805E2-PDW40I

	To Download IA6805E2-PDW40I Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .