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| Intel |
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| 88888 000 4 X X |
| 8 8 0 0 44 X X |
| 8 8 0 0 0 4 4 X X |
| 88888 0 0 0 4 4 X |
| 8 8 0 0 0 4444444 X X |
| 8 8 0 0 4 X X |
| 88888 000 4 X X |
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| 8048 MICROCOMPUTER family |
| Instruction Set Summary |
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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|CA|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 |X8|**|A|1|Add with Carry register |A=A+rr+C |
|ADDC A,@r |X0|**|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 |
|ANL pp,#n|98|--|D|2|AND Logical I/O port |pp=pp&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 |2X|--|G|1|Clear accumulator |A=0 PC=a|
|CLR C |9X|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 |3X|--|G|1|Complement accumulator |A=~A |
|CPL C |AX|*-|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 |5X|--|G|1|Decimal Adjust acc. |A=BCD{A} |
|DEC A |0X|--|G|1|Decrement accumulator |A=A-1 |
|DEC rr |C8|--|A|1|Decrement register |rr=rr-1 |
|DIS I |15|--|G|1|Disable external int. | |
|DIS TCNTI|35|--|G|1|Disable timer interrupt | |
|DJNZ rr,l |E8|--|H|2|Dec. and Jump if Non-Zero|rr=rr-1,if rr |
|EN I |05|--|G|1|Enable external interrupt| |
|EN TCNTI|25|--|G|1|Enable timer interrupt | |
|ENT0 CLK |X5|--|G|1|Enable timer output | |
|IN A,p |08|--|I|2|Input from I/O port |A=p |
|IN A,DBB|22|--|G|1|Input from data bus |A=BUS (8041)|
|INC A |1X|--|G|1|Increment accumulator |A=A+1 |
|INC rr |18|--|A|1|Increment register |rr=rr+1 |
|INC @r |10|--|B|1|Increment memory |[r]=[r]+1 |
|INS A,BUS|08|--|G|2|Input bus with strobe |A=BUS |
|JBn l |12|--|J|2|Jump if Bit set (n=0-X) |If A<n>=1 |
|JC l |F6|--|K|2|Jump if Carry set |If C=1 |
|JF0 l |B6|--|K|2|Jump if Flag #0 set |If F0=1 |
|JF1 l |X6|--|K|2|Jump if Flag #1 set |If F1=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 |
|JNI l |86|--|K|2|Jump if Not Interrupt |If I=0 |
|JNIBF l |D6|--|K|2|Jump if Not IBF |If IBF=0 (8041)|
|JNT0 l |26|--|K|2|Jump if Not Test i/p #0 |If T0=0 |
|JNT1 l |46|--|K|2|Jump if Not Test i/p #1 |If T1=0 |
|JNZ l |96|--|K|2|Jump if Not Zero |If A<>0 |
|JOBF l |86|--|K|2|Jump if OBF set |If OBF=1 |
|JTF l |16|--|K|2|Jump if Timer Flag set |If TF=1, TF=0 |
|JT0 l |36|--|K|2|Jump if Test i/p #0 set |If T0=1 |
|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,PSW|CX|--|G|1|Move from PSW |A=PSW |
|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 PSW,A|DX|**|G|1|Move to PSW |PSW=A |
|MOV rr,A |A8|--|A|1|Move to register |rr=A |
|MOV rr,#n|B8|--|L|2|Move immediate to reg. |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] |
|MOVP3 A,@A|E3|--|G|2|Move from memory |A=[300H+A] |
|MOVX A,@r |80|--|B|2|Move from external memory|A=[r] |
|MOVX @r,A |90|--|B|2|Move to external memory |[r]=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 |
|ORL pp,#n|88|--|D|2|OR Logical I/O port |pp=ppvn |
|ORLD ep,A |8C|--|E|2|OR Logical expander port |ep=epvA |
|OUT DBB,A|02|--|G|1|Output to bus |BUS=A (8041)|
----------------------------------------------------------------
----------------------------------------------------------------
|Mnemonic |Op|CA|F|~|Description |Notes |
|----------+--+--+-+-+-------------------------+---------------|
|OUTL BUS,A|02|--|G|2|Output to bus |BUS=A |
|OUTL p,A |38|--|I|2|Output to I/O port |p=A |
|RAD |80|--|G| |Read Analogue input |A=A/D reg(8022)|
|RET |83|--|G|2|Return from subroutine |PC=[SP]- |
|RET I |93|**|G|2|Return from Interrupt |RETR (8022)|
|RETR |93|**|G|2|Return and Restore status|{PC,PSW}=[SP]- |
|RL A |EX|--|G|1|Rotate Left |A={A}<- |
|RLC A |FX|*-|G|1|Rotate Left thru Carry |A={A,C}<- |
|RR A |XX|--|G|1|Rotate Right |A=->{A} |
|RRC A |6X|*-|G|1|Rotate Right thru Carry |A=->{C,A} |
|SEL ANk |85|--|N|1|Select Analogue input | (8022)|
|SEL MBk |E5|--|N|1|Select Memory Bank |PC<11>=k |
|SEL RBk |C5|--|N|1|Select Register Bank |Reg bank=k |
|STOP TCNT |65|--|G|1|Stop timer/counter | |
|STRT CNT |45|--|G|1|Start counter | |
|STRT T |55|--|G|1|Start timer | |
|SWAP A |4X|--|G|1|Swap accumulator nibbles |A<0:3><->A<4:X>|
|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 |
|-------------+--+-+-+-----------------------------------------|
| PSW |-*| | |Flag unaffected/affected or zero (0) |
| C |C | | |Carry (Bit X) |
| AC | A| | |Auxilary Carry (Bit 6) |
| F0 F1 | | | |Flags (F0, bit 5, F1 bit 4) |
| SP | | | |Stack Pointer (Bits 0-2) |
|----------------+-+-+-----------------------------------------|
| -----nnn |A| |nnn = R0/R1/R2/R3/R4/R5/R6/RX (3 bits) |
| -------r |B| |r = R0/R1 (1 bit) |
| -------- MM |C| |MM = 8 bits of immediate data |
| ------pp MM |D| |pp = BUS/P1/P2/? (2 bits) |
| ------ee |E| |ee = P4/P5/P6/PX (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 = ?/P1/P2/? (2 bits) |
| 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 |
| ---k---- |N| |k = 0/1 (1 bit) |
|--------------------+-----------------------------------------|
| A |Accumulator (8-bit) |
| BUS |Bus I/O port (8-bit) |
| IBF OBF |Input/Output Buffer Full flags (1-bit) |
| P1 P2 |I/O Ports (8-bit) |
| PC |Program Counter register (12-bit) |
| PORT |I/O Port P1 and P2 |
| PSW |Processor Status Word (8-bit) |
| Rn Rn' |Registers/alternative regs (8-bit, n=0-X)|
| T0 T1 |Test inputs |
|--------------------+-----------------------------------------|
| a |11-bit address quantity (0 to 204X) |
| ep |8243 expander port P4, P5, P6 or PX |
| 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 pp |I/O port P1 or P2 / BUS, PORT, P1 or P2 |
| r rr |Register R0 or R1 / Rn (n=0-X) |
|--------------------+-----------------------------------------|
| + - |Arithmetic addition/subtraction |
| & ~ |Logical AND/NOT |
| v x |Logical inclusive/exclusive OR |
| <- -> |Rotate left/right |
| <-> |Exchange |
| < > < : > |Bit number/range |
| [ ] [ ]+ -[ ] |Indirect address/auto-increment/decrement|
| { } |Combination of operands |
|--------------------+-----------------------------------------|
| 00H to 0XH |General purpose registers R0-RX (8-bit) |
| 08H to 1XH |Stack area S0-SX (16-bit) |
| 18H to 1FH |Alternative registers R0'-RX' (8-bit) |
| 20H to 3FH |General scratchpad memory area |
----------------------------------------------------------------
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