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| Intel |
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| 88888 000 22222 1 |
| 8 8 0 0 2 2 11 |
| 8 8 0 0 0 2 1 |
| 88888 0 0 0 222 1 |
| 8 8 0 0 0 2 1 |
| 8 8 0 0 2 1 |
| 88888 000 2222222 111 |
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| 8021 Single-Chip MICROCOMPUTER |
| Instruction Set Summary |
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| _________ _________ |
| _| \__/ |_ |
| <--> P22 |_|1 28|_| Vcc (+5V) |
| _| |_ |
| <--> P23 |_|2 27|_| P21 <--> |
| _| |_ |
| <-- PSEN |_|3 26|_| P20 <--> |
| _| |_ |
| <--> P00 |_|4 25|_| P17 <--> |
| _| |_ |
| <--> P01 |_|5 24|_| P16 <--> |
| _| |_ |
| <--> P02 |_|6 23|_| P15 <--> |
| _| |_ |
| <--> P03 |_|7 8021 22|_| P14 <--> |
| _| |_ |
| <--> P04 |_|8 21|_| P13 <--> |
| _| |_ |
| <--> P05 |_|9 20|_| P12 <--> |
| _| |_ |
| <--> P06 |_|10 19|_| P11 <--> |
| _| |_ |
| <--> P07 |_|11 18|_| P10 <--> |
| _| |_ |
| <-- ALE |_|12 17|_| RESET <-- |
| _| |_ |
| --> T1 |_|13 16|_| XTAL2 <-- |
| _| |_ |
| (GND) Vss |_|14 15|_| XTAL1 <-- |
| |______________________| |
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|Written by Jonathan Bowen |
| Programming Research Group |
| Oxford University Computing Laboratory |
| 8-11 Keble Road |
| Oxford OX1 3QD |
| England |
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| Tel +44-865-273840 |
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|Created May 1983 |
|Updated April 1985 |
|Issue 1.1 Copyright (C) J.P.Bowen 1985|
----------------------------------------------------------------
----------------------------------------------------------------
|Mnemonic |Op|C|F|~|Description |Notes |
|----------+--+-+-+-+--------------------------+---------------|
|ADD A,rr |68|*|A|1|Add register |A=A+rr |
|ADD A,@r |60|*|B|1|Add memory |A=A+[r] |
|ADD A,#n |03|*|C|2|Add immediate |A=A+n |
|ADDC A,rr |78|*|A|1|Add with Carry register |A=A+rr+C |
|ADDC A,@r |70|*|B|1|Add with Carry memory |A=A+[r]+C |
|ADDC A,#n |13|*|C|2|Add with Carry immediate |A=A+n+C |
|ANL A,rr |58|-|A|1|AND Logical register |A=A&rr |
|ANL A,@r |50|-|B|1|AND Logical memory |A=A&[r] |
|ANL A,#n |53|-|C|2|AND Logical Immediate |A=A&n |
|ANLD ep,A |9C|-|E|2|AND Logical expander port |ep=ep&A |
|CALL a |14|-|F|2|Call subroutine |[SP]+={PSW,PC},|
|CLR A |27|-|G|1|Clear accumulator |A=0 PC=a|
|CLR C |97|0|G|1|Clear carry status |C=0 |
|CLR F0 |85|-|G|1|Clear flag #0 |F0=0 |
|CLR F1 |A5|-|G|1|Clear flag #1 |F1=0 |
|CPL A |37|-|G|1|Complement accumulator |A=~A |
|CPL C |A7|*|G|1|Complement carry status |C=~C |
|CPL F0 |95|-|G|1|Complement flag #0 |F0=~F0 |
|CPL F1 |B5|-|G|1|Complement flag #1 |F1=~F1 |
|DA A |57|-|G|1|Decimal Adjust accumulator|A=BCD{A} |
|DEC A |07|-|G|1|Decrement accumulator |A=A-1 |
|DJNZ rr,l |E8|-|H|2|Dec. and Jump if Non-Zero |rr=rr-1,if rr |
|IN A,p |08|-|I|2|Input from I/O port |A=p |
|INC A |17|-|G|1|Increment accumulator |A=A+1 |
|INC rr |18|-|A|1|Increment register |rr=rr+1 |
|JC l |F6|-|K|2|Jump if Carry set |If C=1 |
|JMP a |04|-|F|2|Unconditional Jump |PC=a |
|JMPP @A |B3|-|G|2|Jump on accumulator |PC=PC<8:11>+A |
|JNC l |E6|-|K|2|Jump if Not Carry |If C=0 |
|JNZ l |96|-|K|2|Jump if Not Zero |If A<>0 |
|JTF l |16|-|K|2|Jump if Timer Flag set |If TF=1, TF=0 |
|JT1 l |56|-|K|2|Jump if Test i/p #1 set |If T1=1 |
|JZ l |C6|-|K|2|Jump if Zero |If A=0 |
|MOV A,#n |23|-|C|2|Move from immediate |A=n |
|MOV A,rr |F8|-|A|1|Move from register |A=rr |
|MOV A,@r |F0|-|B|1|Move from memory |A=[r] |
|MOV A,T |42|-|G|1|Move from timer |A=T |
|MOV rr,A |A8|-|A|1|Move to register |rr=A |
|MOV rr,#n|B8|-|L|2|Move immediate to register|rr=n |
|MOV @r,A |A0|-|B|1|Move to memory |[r]=A |
|MOV @r,#n|B0|-|M|2|Move immediate to memory |[r]=n |
|MOV T,A |62|-|G|1|Move to timer |T=A |
|MOVD A,ep |0C|-|E|2|Move from expander port |A=ep |
|MOVD ep,A |3C|-|E|2|Move to expander port |ep=A |
|MOVP A,@A |A3|-|G|1|2|Move from memory |A=[PC<8:11>+A] |
|NOP |00|-|G|1|No Operation | |
|ORL A,rr |48|-|A|1|OR Logical register |A=Avrr |
|ORL A,@r |40|-|B|1|OR Logical memory |A=Av[r] |
|ORL A,#n |43|-|C|2|OR Logical immediate |A=Avn |
|ORLD ep,A |8C|-|E|2|OR Logical expander port |ep=epvA |
|OUTL p,A |38|-|I|2|Output to I/O port |p=A |
|RET |83|-|G|2|Return from subroutine |PC=[SP]- |
|RL A |E7|-|G|1|Rotate Left |A={A}<- |
|RLC A |F7|*|G|1|Rotate Left thru Carry |A={A,C}<- |
|RR A |77|-|G|1|Rotate Right |A=->{A} |
|RRC A |67|*|G|1|Rotate Right thru Carry |A=->{C,A} |
|STOP TCNT |65|-|G|1|Stop timer/counter | |
|STRT CNT |45|-|G|1|Start counter | |
|STRT T |55|-|G|1|Start timer | |
|SWAP A |47|-|G|1|Swap accumulator nibbles |A<0:3><->A<4:7>|
|XCH A,rr |28|-|A|1|Exchange register |A<->rr |
|XCH A,@r |20|-|B|1|Exchange memory |A<->[r] |
|XCHD A,@r |30|-|B|1|Exchange lower nibbles |A<0:3><->[r<:>]|
|XRL A,rr |D8|-|A|1|Exclusive OR register |A=Axrr |
|XRL A,@r |D0|-|B|1|Exclusive OR memory |A=Ax[r] |
|XRL A,#n |D3|-|C|2|Exclusive OR immediate |A=Axn |
|----------+--+-+-+-+------------------------------------------|
|Mnemonic | | | | |Assembler mnemonic |
| |Op| | | |Hex opcode |
| | |C| | |Carry flag |
| | | |F| |Opcode format |
| | | | |~|Machine cycles |
|-------------+-+---+------------------------------------------|
| |-| |Carry unaffected |
| |*| |Carry affected |
| |0| |Carry reset |
----------------------------------------------------------------
----------------------------------------------------------------
|Mnemonic |F| |Description |
|---------------+-+-+------------------------------------------|
| -----nnn |A| |nnn = R0/R1/R2/R3/R4/R5/R6/R7 (3 bits) |
| -------r |B| |r = R0/R1 (1 bit) |
| -------- MM |C| |MM = 8 bits of immediate data |
| ------pp MM |D| |pp = 01 for P1 or 10 for P2 (2 bits) |
| ------ee |E| |ee = P4/P5/P6/P7 (2 bits) |
| xxx----- XX |F| |xxx = high-order 3 bits of memory address |
| -------- |G| |XX = low-order 8 bits of memory address |
| -----nnn XX |H| |nnn = as above |
| ------qq |I| |qq = as pp above |
| bbb----- XX |J| |bbb = 3-bit bit number of accumulator |
| -------- XX |K| |XX = as above |
| -----nnn MM |L| |nnn = as above |
| -------r MM |M| |r = as above |
|-------------------+------------------------------------------|
| A |Accumulator (8-bit) |
| IBF |Input Buffer Full flag (1-bit) |
| OBF |Output Buffer Full flag (1-bit) |
| P1 |I/O Ports #1 (8-bit) |
| P2 |I/O Ports #2 (8-bit) |
| PC |Program Counter register (12-bit) |
| PORT |I/O Port P1 and P2 |
| PSW |Processor Status Word (8-bit) |
| Rn |Registers (8-bit, n=0-7) |
| Rn' |Alternative Registers (8-bit, n=0-7) |
| T1 |Test input |
|-------------------+------------------------------------------|
| a |11-bit address quantity (0 to 2047) |
| ep |8243 expander port P4, P5, P6 or P7 |
| k |1-bit data quantity (0 or 1) |
| l |Low-order 8 bits of a memory address |
| n |8-bit data quantity (0 to 255) |
| p |I/O port P1 or P2 |
| pp |I/O port PORT, P1 or P2 |
| r |Register R0 or R1 |
| rr |Register R0, R1, R2, R3, R4, R5, R6 or R7 |
|-------------------+------------------------------------------|
| + |Arithmetic addition |
| - |Arithmetic subtraction |
| & |Logical AND |
| ~ |Logical NOT |
| v |Logical inclusive OR |
| x |Logical exclusive OR |
| <- |Rotate left |
| -> |Rotate right |
| <-> |Exchange |
| < > |Bit number |
| < : > |Bit range |
| [ ] |Indirect addressing |
| [ ]+ |Indirect addressing auto-increment |
| -[ ] |Auto-decrement indirect addressing |
| { } |Combination of operands |
|-------------------+------------------------------------------|
| 00H to 07H |General purpose registers R0-R7 (8-bit) |
| 08H to 17H |Stack area S0-S7 (16-bit) |
| 18H to 1FH |Alternative registers R0'-R7' (8-bit) |
| 20H to 3FH |General scratchpad memory area |
|--------------------------------------------------------------|
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