Difference between revisions of "Z80"

Revision as of 11:46, 1 April 2008

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.

See also

• Z80 - undocumented opcodes

Tutorials

Weblinks

• Zilog [1]
• Computer Systems based on Z80 Family

Opcodes

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

|JP $NN | 10 | 3 |------|C3 XX XX |Unconditional Jump |PC=nn | |JP (HL) | 4 | 1 |------|E9 |Unconditional Jump |PC=(HL) | |JP (IX) | 8 | 2 |------|DD E9 |Unconditional Jump |PC=(xx) | |JP (IY) | 8 | 2 | |FD E9 | | | |JP C,$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. -------------+----+---+------+------------+---------------------+----------------------#