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| |
| Zilog |
| |
| ZZZZZZZ 88888 000 |
| Z 8 8 0 0 |
| Z 8 8 0 0 0 |
| Z 88888 0 0 0 |
| Z 8 8 0 0 0 |
| Z 8 8 0 0 |
| ZZZZZZZ 88888 000 |
| |
| Z80 Instruction Set Summary |
| |
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|Mnemonic |SZHPNC|Description |Notes |
|----------+------+---------------------+----------------------|
|ADC A,s |***V0*|Add with Carry |A=A+s+CY |
|ADC HL,ss |**?V0*|Add with Carry |HL=HL+ss+CY |
|ADD A,s |***V0*|Add |A=A+s |
|ADD HL,ss |--?-0*|Add |HL=HL+ss |
|ADD IX,pp |--?-0*|Add |IX=IX+pp |
|ADD IY,rr |--?-0*|Add |IY=IY+rr |
|AND s |***P00|Logical AND |A=A&s |
|BIT b,m |?*1?0-|Test Bit |m&{2^b} |
|CALL cc,nn|------|Conditional Call |If cc CALL |
|CALL nn |------|Unconditional Call |-[SP]=PC,PC=nn |
|CCF |--?-0*|Complement Carry Flag|CY=~CY |
|CP s |***V1*|Compare |A-s |
|CPD |****1-|Compare and Decrement|A-[HL],HL=HL-1,BC=BC-1|
|CPDR |****1-|Compare, Dec., Repeat|CPD till A=[HL]or BC=0|
|CPI |****1-|Compare and Increment|A-[HL],HL=HL+1,BC=BC-1|
|CPIR |****1-|Compare, Inc., Repeat|CPI till A=[HL]or BC=0|
|CPL |--1-1-|Complement |A=~A |
|DAA |***P-*|Decimal Adjust Acc. |A=BCD format |
|DEC s |***V1-|Decrement |s=s-1 |
|DEC xx |------|Decrement |xx=xx-1 |
|DEC ss |------|Decrement |ss=ss-1 |
|DI |------|Disable Interrupts | |
|DJNZ e |------|Dec., Jump Non-Zero |B=B-1 till B=0 |
|EI |------|Enable Interrupts | |
|EX [SP],HL|------|Exchange |[SP]<->HL |
|EX [SP],xx|------|Exchange |[SP]<->xx |
|EX AF,AF' |------|Exchange |AF<->AF' |
|EX DE,HL |------|Exchange |DE<->HL |
|EXX |------|Exchange |qq<->qq' (except AF)|
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|Mnemonic |SZHPNC|Description |Notes |
|----------+------+---------------------+----------------------|
|HALT |------|Halt | |
|IM n |------|Interrupt Mode | (n=0,1,2)|
|IN A,[n] |------|Input |A=[n] |
|IN r,[C] |***P0-|Input |r=[C] |
|INC r |***V0-|Increment |r=r+1 |
|INC [HL] |***V0-|Increment |[HL]=[HL]+1 |
|INC xx |------|Increment |xx=xx+1 |
|INC [xx+d]|***V0-|Increment |[xx+d]=[xx+d]+1 |
|INC ss |------|Increment |ss=ss+1 |
|IND |?*??1-|Input and Decrement |[HL]=[C],HL=HL-1,B=B-1|
|INDR |?1??1-|Input, Dec., Repeat |IND till B=0 |
|INI |?*??1-|Input and Increment |[HL]=[C],HL=HL+1,B=B-1|
|INIR |?1??1-|Input, Inc., Repeat |INI till B=0 |
|JP [HL] |------|Unconditional Jump |PC=[HL] |
|JP [xx] |------|Unconditional Jump |PC=[xx] |
|JP nn |------|Unconditional Jump |PC=nn |
|JP cc,nn |------|Conditional Jump |If cc JP |
|JR e |------|Unconditional Jump |PC=PC+e |
|JR cc,e |------|Conditional Jump |If cc JR(cc=C,NC,NZ,Z)|
|LD dst,src|------|Load |dst=src |
|LD A,i |**0*0-|Load |A=i (i=I,R)|
|LDD |--0*0-|Load and Decrement |[DE]=[HL],HL=HL-1,# |
|LDDR |--000-|Load, Dec., Repeat |LDD till BC=0 |
|LDI |--0*0-|Load and Increment |[DE]=[HL],HL=HL+1,# |
|LDIR |--000-|Load, Inc., Repeat |LDI till BC=0 |
|NEG |***V1*|Negate |A=-A |
|NOP |------|No Operation | |
|OR s |***P00|Logical inclusive OR |A=Avs |
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|Mnemonic |SZHPNC|Description |Notes |
|----------+------+---------------------+----------------------|
|OTDR |?1??1-|Output, Dec., Repeat |OUTD till B=0 |
|OTIR |?1??1-|Output, Inc., Repeat |OUTI till B=0 |
|OUT [C],r |------|Output |[C]=r |
|OUT [n],A |------|Output |[n]=A |
|OUTD |?*??1-|Output and Decrement |[C]=[HL],HL=HL-1,B=B-1|
|OUTI |?*??1-|Output and Increment |[C]=[HL],HL=HL+1,B=B-1|
|POP xx |------|Pop |xx=[SP]+ |
|POP qq |------|Pop |qq=[SP]+ |
|PUSH xx |------|Push |-[SP]=xx |
|PUSH qq |------|Push |-[SP]=qq |
|RES b,m |------|Reset bit |m=m&{~2^b} |
|RET |------|Return |PC=[SP]+ |
|RET cc |------|Conditional Return |If cc RET |
|RETI |------|Return from Interrupt|PC=[SP]+ |
|RETN |------|Return from NMI |PC=[SP]+ |
|RL m |**0P0*|Rotate Left |m={CY,m}<- |
|RLA |--0-0*|Rotate Left Acc. |A={CY,A}<- |
|RLC m |**0P0*|Rotate Left Circular |m=m<- |
|RLCA |--0-0*|Rotate Left Circular |A=A<- |
|RLD |**0P0-|Rotate Left 4 bits |{A,[HL]}={A,[HL]}<- ##|
|RR m |**0P0*|Rotate Right |m=->{CY,m} |
|RRA |--0-0*|Rotate Right Acc. |A=->{CY,A} |
|RRC m |**0P0*|Rotate Right Circular|m=->m |
|RRCA |--0-0*|Rotate Right Circular|A=->A |
|RRD |**0P0-|Rotate Right 4 bits |{A,[HL]}=->{A,[HL]} ##|
|RST p |------|Restart | (p=0H,8H,10H,...,38H)|
|SBC A,s |***V1*|Subtract with Carry |A=A-s-CY |
|SBC HL,ss |**?V1*|Subtract with Carry |HL=HL-ss-CY |
|SCF |--0-01|Set Carry Flag |CY=1 |
|SET b,m |------|Set bit |m=mv{2^b} |
|SLA m |**0P0*|Shift Left Arithmetic|m=m*2 |
|SRA m |**0P0*|Shift Right Arith. |m=m/2 |
|SRL m |**0P0*|Shift Right Logical |m=->{0,m,CY} |
|SUB s |***V1*|Subtract |A=A-s |
|XOR s |***P00|Logical Exclusive OR |A=Axs |
|----------+------+--------------------------------------------|
| F |-*01? |Flag unaffected/affected/reset/set/unknown |
| S |S |Sign flag (Bit 7) |
| Z | Z |Zero flag (Bit 6) |
| HC | H |Half Carry flag (Bit 4) |
| P/V | P |Parity/Overflow flag (Bit 2, V=overflow) |
| N | N |Add/Subtract flag (Bit 1) |
| CY | C|Carry flag (Bit 0) |
|-----------------+--------------------------------------------|
| n |Immediate addressing |
| nn |Immediate extended addressing |
| e |Relative addressing (PC=PC+2+offset) |
| [nn] |Extended addressing |
| [xx+d] |Indexed addressing |
| r |Register addressing |
| [rr] |Register indirect addressing |
| |Implied addressing |
| b |Bit addressing |
| p |Modified page zero addressing (see RST) |
|-----------------+--------------------------------------------|
|DEFB n(,...) |Define Byte(s) |
|DEFB 'str'(,...) |Define Byte ASCII string(s) |
|DEFS nn |Define Storage Block |
|DEFW nn(,...) |Define Word(s) |
|-----------------+--------------------------------------------|
| A B C D E |Registers (8-bit) |
| AF BC DE HL |Register pairs (16-bit) |
| F |Flag register (8-bit) |
| I |Interrupt page address register (8-bit) |
| IX IY |Index registers (16-bit) |
| PC |Program Counter register (16-bit) |
| R |Memory Refresh register |
| SP |Stack Pointer register (16-bit) |
|-----------------+--------------------------------------------|
| b |One bit (0 to 7) |
| cc |Condition (C,M,NC,NZ,P,PE,PO,Z) |
| d |One-byte expression (-128 to +127) |
| dst |Destination s, ss, [BC], [DE], [HL], [nn] |
| e |One-byte expression (-126 to +129) |
| m |Any register r, [HL] or [xx+d] |
| n |One-byte expression (0 to 255) |
| nn |Two-byte expression (0 to 65535) |
| pp |Register pair BC, DE, IX or SP |
| qq |Register pair AF, BC, DE or HL |
| qq' |Alternative register pair AF, BC, DE or HL |
| r |Register A, B, C, D, E, H or L |
| rr |Register pair BC, DE, IY or SP |
| s |Any register r, value n, [HL] or [xx+d] |
| src |Source s, ss, [BC], [DE], [HL], nn, [nn] |
| ss |Register pair BC, DE, HL or SP |
| xx |Index register IX or IY |
|-----------------+--------------------------------------------|
| + - * / ^ |Add/subtract/multiply/divide/exponent |
| & ~ v x |Logical AND/NOT/inclusive OR/exclusive OR |
| <- -> |Rotate left/right |
| [ ] |Indirect addressing |
| [ ]+ -[ ] |Indirect addressing auto-increment/decrement|
| { } |Combination of operands |
| # |Also BC=BC-1,DE=DE-1 |
| ## |Only lower 4 bits of accumulator A used |
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Source: z80.info
Source: Wikipedia Z80