Z80

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Zilog Z80A

Microprocessor from Zilog, wich is used in the Amstrad CPC Computers. The Z80/Z80A was a very popular microprocessor, used in a great variety of home computers and appliances as far-fetched as satelites. It was even used in the Commodore C128 as a secondary processor in order to achieve CP/M compatibility.

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Opcodes

Check the end of the document for explanations of abbreviations used below.

Mnemonic Clock Size SZHPNC Opcode Description Notes
ADC A, r 4 1 *** V0 * 88 + rb Add with Carry A = A + s + CY
ADC A, N 7 2 CE XX
ADC A, (HL) 7 1 8E
ADC A, (IX + N) 19 3 DD 8E XX
ADC A, (IY + N) 19 3 FD 8E XX
ADC HL, BC 15 2 **? V0 * ED 4A Add with Carry HL = HL + ss + CY
ADC HL, DE 15 2 ED 5A
ADC HL, HL 15 2 ED 6A
ADC HL, SP 15 2 ED 7A
ADD A, r 4 1 *** V0 * 80 + rb Add (8-bit) A = A + s
ADD A, N 7 2 C6 XX
ADD A, (HL) 7 1 86
ADD A, (IX + N) 19 3 DD 86 XX
ADD A, (IY + N) 19 3 FD 86 XX
ADD HL, BC 11 1 --?- 0 * 09 Add (16-bit) HL = HL + ss
ADD HL, DE 11 1 19
ADD HL, HL 11 1 29
ADD HL, SP 11 1 39
ADD IX, BC 15 2 --?- 0 * DD 09 Add (IX register) IX = IX + pp
ADD IX, DE 15 2 DD 19
ADD IX, IX 15 2 DD 29
ADD IX, SP 15 2 DD 39
ADD IY, BC 15 2 --?- 0 * FD 09 Add (IY register) IY = IY + rr
ADD IY, 15 2 FD 19
ADD IY, IY 15 2 FD 29
ADD IY, SP 15 2 FD 39
AND r 4 1 ***P00 A0+rb Logical AND A=A&s
AND N 7 2 E6 XX
AND (HL) 7 1 A6
AND (IX+N) 19 3 DD A6 XX
AND (IY+N) 19 3 FD A6 XX
BIT b,r 8 2 ?*1?0- CB 40+8*b+rb Test Bit m&{2^b}
BIT b,(HL) 12 2 CB 46+8*b
BIT b,(IX+N) 20 4 DD CB XX 46+8*b
BIT b,(IY+N) 20 4 FD CB XX 46+8*b
CALL NN 17 3 ------ CD XX XX Unconditional Call -(SP)=PC,PC=nn
CALL C,NN 17/1 3 ------ DC XX XX Conditional Call If Carry = 1
CALL NC,NN 17/1 3 D4 XX XX If carry = 0
CALL M,NN 17/1 3 FC XX XX If Sign = 1 (negative)
CALL P,NN 17/1 3 F4 XX XX If Sign = 0 (positive)
CALL Z,NN 17/1 3 CC XX XX If Zero = 1 (ans.=0)
CALL NZ,NN 17/1 3 C4 XX XX If Zero = 0 (non-zero)
CALL PE,NN 17/1 3 EC XX XX If Parity = 1 (even)
CALL PO,NN 17/1 3 E4 XX XX If Parity = 0 (odd)
CCF 4 1 --?-0* 3F Complement Carry Flag CY=~CY
CP r 4 1 ***V1* B8+rb Compare Compare A-s
CP N 7 2 FE XX
CP (HL) 7 1 BE
CP (IX+N) 19 3 DD BE XX
CP (IY+N) 19 3 FD BE XX
CPD 16 2 ****1- ED A9 Compare and Decrement A-(HL),HL=HL-1,BC=BC-1
CPDR 21/1 2 ****1- ED B9 Compare, Dec., Repeat CPD till A=(HL)or BC=0
CPI 16 2 ****1- ED A1 Compare and Increment A-(HL),HL=HL+1,BC=BC-1
CPIR 21/1 2 ****1- ED B1 Compare, Inc., Repeat CPI till A=(HL)or BC=0
CPL 4 1 --1-1- 2F Complement A=~A
DAA 4 1 ***P-* 27 Decimal Adjust Acc. A=BCD format (dec.)
DEC A 4 1 ***V1- 3D Decrement (8-bit) s=s-1
DEC B 4 1 05
DEC C 4 1 0D
DEC D 4 1 15
DEC E 4 1 1D
DEC H 4 1 25
DEC L 4 2 2D
DEC (HL) 11 1 35
DEC (IX+N) 23 3 DD 35 XX
DEC (IY+N) 23 3 FD 35 XX
DEC BC 6 1 ------ 0B Decrement (16-bit) ss=ss-1
DEC DE 6 1 1B
DEC HL 6 1 2B
DEC SP 6 1 3B
DEC IX 10 2 ------ DD 2B Decrement xx=xx-1
DEC IY 10 2 FD 2B
DI 4 1 ------ F3 Disable Interrupts
DJNZ $+2 13/8 1 ------ 10 Dec., Jump Non-Zero B=B-1 till B=0
EI 4 1 ------ FB Enable Interrupts
EX (SP),HL 19 1 ------ E3 Exchange (SP)<->HL
EX (SP),IX 23 2 ------ DD E3 (SP)<->xx
EX (SP),IY 23 2 FD E3
EX AF,AF' 4 1 ------ 08 AF<->AF'
EX DE,HL 4 1 ------ EB DE<->HL
EXX 4 1 ------ D9 Exchange qq<->qq' (except AF)
HALT 4 1 ------ 76 Halt
IM 0 8 2 ------ ED 46 Interrupt Mode (n=0,1,2)|
IM 1 8 2 ED 56
IM 2 8 2 ED 5E
IN A,(N) 11 2 ------ DB XX Input A=(n)
IN (C) 12 2 ***P0- ED 70 Input* (Unsupported)
IN A,(C) 12 2 ***P0- ED 78 Input r=(C)
IN B,(C) 12 2 ED 40
IN C,(C) 12 2 ED 48
IN D,(C) 12 2 ED 50
IN E,(C) 12 2 ED 58
IN H,(C) 12 2 ED 60
IN L,(C) 12 2 ED 68
INC A 4 1 ***V0- 3C Increment (8-bit) r=r+1
INC B 4 1 04
INC C 4 1 0C
INC D 4 1 14
INC E 4 1 1C
INC H 4 1 24
INC L 4 1 2C
INC BC 6 1 ------ 03 Increment (16-bit) ss=ss+1
INC DE 6 1 13
INC HL 6 1 23
INC SP 6 1 33
INC IX 10 2 ------ DD 23 Increment xx=xx+1
INC IY 10 2 FD 23
INC (HL) 11 1 ***V0- 34 Increment (indirect) (HL)=(HL)+1
INC (IX+N) 23 3 ***V0- DD 34 XX Increment (xx+d)=(xx+d)+1
INC (IY+N) 23 3 FD 34 XX
IND 16 2 ?*??1- ED AA Input and Decrement (HL)=(C),HL=HL-1,B=B-1
INDR 21/1 2 ?1??1- ED BA Input, Dec., Repeat IND till B=0
INI 16 2 ?*??1- ED A2 Input and Increment (HL)=(C),HL=HL+1,B=B-1
INIR 21/1 2 ?1??1- ED B2 Input, Inc., Repeat INI till B=0
JP NN 10 3 ------ C3 XX XX Unconditional Jump PC=nn
JP (HL) 4 1 ------ E9 PC=(HL)
JP (IX) 8 2 ------ DD E9 PC=(xx)
JP (IY) 8 2 FD E9
JP C,$NN 10/1 3 ------ DA XX XX Conditional Jump If Carry = 1
JP NC,$NN 10/1 3 D2 XX XX If Carry = 0
JP M,$NN 10/1 3 FA XX XX If Sign = 1 (negative)
JP P,$NN 10/1 3 F2 XX XX If Sign = 0 (positive)
JP Z,$NN 10/1 3 CA XX XX If Zero = 1 (ans.= 0)
JP NZ,$NN 10/1 3 C2 XX XX If Zero = 0 (non-zero)
JP PE,$NN 10/1 3 EA XX XX If Parity = 1 (even)
JP PO,$NN 10/1 3 E2 XX XX If Parity = 0 (odd)
JR $N+2 12 2 ------ 18 XX Relative Jump PC=PC+e
JR C,$N+2 12/7 2 ------ 38 XX Cond. Relative Jump If cc JR(cc=C,NC,NZ,Z)
JR NC,$N+2 12/7 2 30 XX
JR Z,$N+2 12/7 2 28 XX
JR NZ,$N+2 12/7 2 20 XX
LD I,A 9 2 ------ ED 47 Load* dst=src
LD R,A 9 2 ED 4F
LD A,I 9 2 **0*0- ED 57 Load* dst=src
LD A,R 9 2 ED 5F
LD A,r 4 1 ------ 78+rb Load (8-bit) dst=src
LD A,N 7 2 3E XX
LD A,(BC) 7 1 0A
LD A,(DE) 7 1 1A
LD A,(HL) 7 1 7E
LD A,(IX+N) 19 3 DD 7E XX
LD A,(IY+N) 19 3 FD 7E XX
LD A,(NN) 13 3 3A XX XX
LD B,r 4 1 40+rb
LD B,N 7 2 06 XX
LD B,(HL) 7 1 46
LD B,(IX+N) 19 3 DD 46 XX
LD B,(IY+N) 19 3 FD 46 XX
LD C,r 4 1 48+rb
LD C,N 7 2 0E XX
LD C,(HL) 7 1 4E
LD C,(IX+N) 19 3 DD 4E XX
LD C,(IY+N) 19 3 FD 4E XX
LD D,r 4 1 50+rb
LD D,N 7 2 16 XX
LD D,(HL) 7 1 56
LD D,(IX+N) 19 3 DD 56 XX
LD D,(IY+N) 19 3 FD 56 XX
LD E,r 4 1 58+rb
LD E,N 7 2 1E XX
LD E,(HL) 7 1 5E
LD E,(IX+N) 19 3 DD 5E XX
LD E,(IY+N) 19 3 FD 5E XX
LD H,r 4 1 60+rb
LD H,N 7 2 26 XX
LD H,(HL) 7 1 66
LD H,(IX+N) 19 3 DD 66 XX
LD H,(IY+N) 19 3 FD 66 XX
LD L,r 4 1 68+rb
LD L,N 7 2 2E XX
LD L,(HL) 7 1 6E
LD L,(IX+N) 19 3 DD 6E XX
LD L,(IY+N) 19 3 FD 6E XX
LD BC,(NN) 20 4 ------ ED 4B XX XX Load (16-bit) dst=src
LD BC,NN 10 3 01 XX XX
LD DE,(NN) 20 4 ED 5B XX XX
LD DE,NN 10 3 11 XX XX
LD HL,(NN) 20 3 2A XX XX
LD HL,NN 10 3 21 XX XX
LD SP,(NN) 20 4 ED 7B XX XX
LD SP,HL 6 1 F9
LD SP,IX 10 2 DD F9
LD SP,IY 10 2 FD F9
LD SP,NN 10 3 31 XX XX
LD IX,(NN) 20 4 DD 2A XX XX
LD IX,NN 14 4 DD 21 XX XX
LD IY,(NN) 20 4 FD 2A XX XX
LD IY,NN 14 4 FD 21 XX XX
LD (HL),r 7 1 ------ 70+rb Load (Indirect) dst=src
LD (HL),N 10 2 36 XX
LD (BC),A 7 1 02
LD (DE),A 7 1 12
LD (NN),A 13 3 32 XX XX
LD (NN),BC 20 4 ED 43 XX XX
LD (NN),DE 20 4 ED 53 XX XX
LD (NN),HL 16 3 22 XX XX
LD (NN),IX 20 4 DD 22 XX XX
LD (NN),IY 20 4 FD 22 XX XX
LD (NN),SP 20 4 ED 73 XX XX
LD (IX+N),r 19 3 DD 70+rb XX
LD (IX+N),N 19 4 DD 36 XX XX
LD (IY+N),r 19 3 FD 70+rb XX
LD (IY+N),N 19 4 FD 36 XX XX
LDD 16 2 --0*0- ED A8 Load and Decrement (DE)=(HL),HL=HL-1,#
LDDR 21/1 2 --000- ED B8 Load, Dec., Repeat LDD till BC=0
LDI 16 2 --0*0- ED A0 Load and Increment (DE)=(HL),HL=HL+1,#
LDIR 21/1 2 --000- ED B0 Load, Inc., Repeat LDI till BC=0
NEG 8 2 ***V1* ED 44 Negate A=-A
NOP 4 1 ------ 00 No Operation
OR r 4 1 ***P00 B0+rb Logical inclusive OR A=Avs
OR N 7 2 F6 XX
OR (HL) 7 1 B6
OR (IX+N) 19 3 DD B6 XX
OR (IY+N) 19 3 FD B6 XX
OUT (N),A 11 2 ------ D3 XX Output (n)=A
OUT (C),0 12 2 ------ ED 71 Output* (Unsupported)
OUT (C),A 12 2 ------ ED 79 Output (C)=r
OUT (C),B 12 2 ED 41
OUT (C),C 12 2 ED 49
OUT (C),D 12 2 ED 51
OUT (C),E 12 2 ED 59
OUT (C),H 12 2 ED 61
OUT (C),L 12 2 ED 69






+-------------+----+---+------+------------+---------------------+----------------------+ |OUTD | 16 | 2 |?*??1-|ED AB |Output and Decrement |(C)=(HL),HL=HL-1,B=B-1| |OTDR |21/1| 2 |?1??1-|ED BB |Output, Dec., Repeat |OUTD till B=0 | |OUTI | 16 | 2 |?*??1-|ED A3 |Output and Increment |(C)=(HL),HL=HL+1,B=B-1| |OTIR |21/1| 2 |?1??1-|ED B3 |Output, Inc., Repeat |OUTI till B=0 | +-------------+----+---+------+------------+---------------------+----------------------+ |POP AF | 10 | 1 |------|F1 |Pop |qq=(SP)+ | |POP BC | 10 | 1 | |C1 | | | |POP DE | 10 | 1 | |D1 | | | |POP HL | 10 | 1 | |E1 | | | |POP IX | 14 | 2 |------|DD E1 |Pop |xx=(SP)+ | |POP IY | 14 | 2 | |FD E1 | | | |PUSH AF | 11 | 1 |------|F5 |Push |-(SP)=qq | |PUSH BC | 11 | 1 | |C5 | | | |PUSH DE | 11 | 1 | |D5 | | | |PUSH HL | 11 | 1 | |E5 | | | |PUSH IX | 15 | 2 |------|DD E5 |Push |-(SP)=xx | |PUSH IY | 15 | 2 | |FD E5 | | | +-------------+----+---+------+------------+---------------------+----------------------+ |RES b,r | 8 | 2 |------|CB 80+8*b+rb|Reset bit |m=m&{~2^b} | |RES b,(HL) | 15 | 2 |------|CB 86+8*b | | | |RES b,(IX+N) | 23 | 4 |------|DD CB XX 86+8*b | | |RES b,(IY+N) | 23 | 4 |------|FD CB XX 86+8*b | | +-------------+----+---+------+------------+---------------------+----------------------+ |RET | 10 | 1 |------|C9 |Return |PC=(SP)+ | |RET C |11/5| 1 |------|D8 |Conditional Return |If Carry = 1 | |RET NC |11/5| 1 | |D0 | |If Carry = 0 | |RET M |11/5| 1 | |F8 | |If Sign = 1 (negative)| |RET P |11/5| 1 | |F0 | |If Sign = 0 (positive)| |RET Z |11/5| 1 | |C8 | |If Zero = 1 (ans.=0) | |RET NZ |11/5| 1 | |C0 | |If Zero = 0 (non-zero)| |RET PE |11/5| 1 | |E8 | |If Parity = 1 (even) | |RET PO |11/5| 1 | |E0 | |If Parity = 0 (odd) | +-------------+----+---+------+------------+---------------------+----------------------+ |RETI | 14 | 2 |------|ED 4D |Return from Interrupt|PC=(SP)+ | |RETN | 14 | 2 |------|ED 45 |Return from NMI |PC=(SP)+ | +-------------+----+---+------+------------+---------------------+----------------------+ |RLA | 4 | 1 |--0-0*|17 |Rotate Left Acc. |A={CY,A}<- | |RL r | 8 | 2 |**0P0*|CB 10+rb |Rotate Left |m={CY,m}<- | |RL (HL) | 15 | 2 | |CB 16 | | | |RL (IX+N) | 23 | 4 | |DD CB XX 16 | | | |RL (IY+N) | 23 | 4 | |FD CB XX 16 | | | |RLCA | 4 | 1 |--0-0*|07 |Rotate Left Cir. Acc.|A=A<- | |RLC r | 8 | 2 |**0P0*|CB 00+rb |Rotate Left Circular |m=m<- | |RLC (HL) | 15 | 2 | |CB 06 | | | |RLC (IX+N) | 23 | 4 | |DD CB XX 06 | | | |RLC (IY+N) | 23 | 4 | |FD CB XX 06 | | | |RLD | 18 | 2 |**0P0-|ED 6F |Rotate Left 4 bits |{A,(HL)}={A,(HL)}<- ##| |RRA | 4 | 1 |--0-0*|1F |Rotate Right Acc. |A=->{CY,A} | |RR r | 8 | 2 |**0P0*|CB 18+rb |Rotate Right |m=->{CY,m} | |RR (HL) | 15 | 2 | |CB 1E | | | |RR (IX+N) | 23 | 4 | |DD CB XX 1E | | | |RR (IY+N) | 23 | 4 | |FD CB XX 1E | | | |RRCA | 4 | 1 |--0-0*|0F |Rotate Right Cir.Acc.|A=->A | |RRC r | 8 | 2 |**0P0*|CB 08+rb |Rotate Right Circular|m=->m | |RRC (HL) | 15 | 2 | |CB 0E | | | |RRC (IX+N) | 23 | 4 | |DD CB XX 0E | | | |RRC (IY+N) | 23 | 4 | |FD CB XX 0E | | | |RRD | 18 | 2 |**0P0-|ED 67 |Rotate Right 4 bits |{A,(HL)}=->{A,(HL)} ##| +-------------+----+---+------+------------+---------------------+----------------------+ |RST 0 | 11 | 1 |------|C7 |Restart | (p=0H,8H,10H,...,38H)| |RST 08H | 11 | 1 | |CF | | | |RST 10H | 11 | 1 | |D7 | | | |RST 18H | 11 | 1 | |DF | | | |RST 20H | 11 | 1 | |E7 | | | |RST 28H | 11 | 1 | |EF | | | |RST 30H | 11 | 1 | |F7 | | | |RST 38H | 11 | 1 | |FF | | | +-------------+----+---+------+------------+---------------------+----------------------+ |SBC r | 4 | 1 |***V1*|98+rb |Subtract with Carry |A=A-s-CY | |SBC A,N | 7 | 2 | |DE XX | | | |SBC (HL) | 7 | 1 | |9E | | | |SBC A,(IX+N) | 19 | 3 | |DD 9E XX | | | |SBC A,(IY+N) | 19 | 3 | |FD 9E XX | | | |SBC HL,BC | 15 | 2 |**?V1*|ED 42 |Subtract with Carry |HL=HL-ss-CY | |SBC HL,DE | 15 | 2 | |ED 52 | | | |SBC HL,HL | 15 | 2 | |ED 62 | | | |SBC HL,SP | 15 | 2 | |ED 72 | | | +-------------+----+---+------+------------+---------------------+----------------------+ |SCF | 4 | 1 |--0-01|37 |Set Carry Flag |CY=1 | +-------------+----+---+------+------------+---------------------+----------------------+ |SET b,r | 8 | 2 |------|CB C0+8*b+rb|Set bit |m=mv{2^b} | |SET b,(HL) | 15 | 2 | |CB C6+8*b | | | |SET b,(IX+N) | 23 | 4 | |DD CB XX C6+8*b | | |SET b,(IY+N) | 23 | 4 | |FD CB XX C6+8*b | | +-------------+----+---+------+------------+---------------------+----------------------+ |SLA r | 8 | 2 |**0P0*|CB 20+rb |Shift Left Arithmetic|m=m*2 | |SLA (HL) | 15 | 2 | |CB 26 | | | |SLA (IX+N) | 23 | 4 | |DD CB XX 26 | | | |SLA (IY+N) | 23 | 4 | |FD CB XX 26 | | | |SRA r | 8 | 2 |**0P0*|CB 28+rb |Shift Right Arith. |m=m/2 | |SRA (HL) | 15 | 2 | |CB 2E | | | |SRA (IX+N) | 23 | 4 | |DD CB XX 2E | | | |SRA (IY+N) | 23 | 4 | |FD CB XX 2E | | | +-------------+----+---+------+------------+---------------------+----------------------+ |SLL r | 8 | 2 |**0P0*|CB 30+rb |Shift Left Logical* |m={0,m,CY}<- | |SLL (HL) | 15 | 2 | |CB 36 | | (SLL instructions | |SLL (IX+N) | 23 | 4 | |DD CB XX 36 | | are Unsupported) | |SLL (IY+N) | 23 | 4 | |FD CB XX 36 | | | |SRL r | 8 | 2 |**0P0*|CB 38+rb |Shift Right Logical |m=->{0,m,CY} | |SRL (HL) | 15 | 2 | |CB 3E | | | |SRL (IX+N) | 23 | 4 | |DD CB XX 3E | | | |SRL (IY+N) | 23 | 4 | |FD CB XX 3E | | | +-------------+----+---+------+------------+---------------------+----------------------+ |SUB r | 4 | 1 |***V1*|90+rb |Subtract |A=A-s | |SUB N | 7 | 2 | |D6 XX | | | |SUB (HL) | 7 | 1 | |96 | | | |SUB (IX+N) | 19 | 3 | |DD 96 XX | | | |SUB (IY+N) | 19 | 3 | |FD 96 XX | | | +-------------+----+---+------+------------+---------------------+----------------------+ |XOR r | 4 | 1 |***P00|A8+rb |Logical Exclusive OR |A=Axs | |XOR N | 7 | 2 | |EE XX | | | |XOR (HL) | 7 | 1 | |AE | | | |XOR (IX+N) | 19 | 3 | |DD AE XX | | | |XOR (IY+N) | 19 | 3 | |FD AE XX | | |

  1. -------------+----+---+------+------------+---------------------+----------------------#
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