Here is a list of how many clockcycles
the z80 instructions take.
Let's optimize!
Mnemonic Clock Siz OP-Code
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 A,r 4 1 88+rb
ADC A,N 7 2 CE XX
ADC HL,BC 15 2 ED 4A
ADC HL,DE 15 2 ED 5A
ADC HL,HL 15 2 ED 6A
ADC HL,SP 15 2 ED 7A
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 A,r 4 1 80+rb
ADD A,N 7 2 C6 XX
ADD HL,BC 11 1 09
ADD HL,DE 11 1 19
ADD HL,HL 11 1 29
ADD HL,SP 11 1 39
ADD IX,BC 15 2 DD 09
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 FD 09
ADD IY,DE 15 2 FD 19
ADD IY,IY 15 2 FD 29
ADD IY,SP 15 2 FD 39
AND (HL) 7 1 A6
AND (IX+N) 19 3 DD A6 XX
AND (IY+N) 19 3 FD A6 XX
AND r 4 1 A0+rb
AND N 7 2 E6 XX
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
BIT b,r 8 2 CB 40+8*b+rb
CALL C,NN 17/1 3 DC XX XX
CALL M,NN 17/1 3 FC XX XX
CALL NC,NN 17/1 3 D4 XX XX
CALL NC,NN 17/1 3 D4 XX XX
CALL NN 17 3 CD XX XX
CALL NZ,NN 17/1 3 C4 XX XX
CALL P,NN 17/1 3 F4 XX XX
CALL PE,NN 17/1 3 EC XX XX
CALL PO,NN 17/1 3 E4 XX XX
CALL Z,NN 17/1 3 CC XX XX
CCF 4 1 3F
CP (HL) 7 1 BE
CP (IX+N) 19 3 DD BE XX
CP (IY+N) 19 3 FD BE XX
CP r 4 1 B8+rb
CP N 7 2 FE XX
CPD 16 2 ED A9
CPDR 21/1 2 ED B9
CPI 16 2 ED A1
CPIR 21/1 2 ED B1
CPL 4 1 2F
DAA 4 1 27
DEC (HL) 11 1 35
DEC (IX+N) 23 3 DD 35 XX
DEC (IY+N) 23 3 FD 35 XX
DEC A 4 1 3D
DEC B 4 1 05
DEC BC 6 1 0B
DEC C 4 1 0D
DEC D 4 1 15
DEC DE 6 1 1B
DEC E 4 1 1D
DEC H 4 1 25
DEC HL 6 1 2B
DEC IX 10 2 DD 2B
DEC IY 10 2 FD 2B
DEC L 4 2 2D
DEC SP 6 1 3B
DI 4 1 F3
DJNZ $+2 13/8 1 10
EI 4 1 FB
EX (SP),HL 19 1 E3
EX (SP),IX 23 2 DD E3
EX (SP),IY 23 2 FD E3
EX AF,AF' 4 1 08
EX DE,HL 4 1 EB
EXX 4 1 D9
HALT 4 1 76
IM 0 8 2 ED 46
IM 1 8 2 ED 56
IM 2 8 2 ED 5E
IN A,(C) 12 2 ED 78
IN A,(N) 11 2 DB XX
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 (HL) 11 1 34
INC (IX+N) 23 3 DD 34 XX
INC (IY+N) 23 3 FD 34 XX
INC A 4 1 3C
INC B 4 1 04
INC BC 6 1 03
INC C 4 1 0C
INC D 4 1 14
INC DE 6 1 13
INC E 4 1 1C
INC H 4 1 24
INC HL 6 1 23
INC IX 10 2 DD 23
INC IY 10 2 FD 23
INC L 4 1 2C
INC SP 6 1 33
IND 16 2 ED AA
INDR 21/1 2 ED BA
INI 16 2 ED A2
INIR 21/1 2 ED B2
JP $NN 10 3 C3 XX XX
JP (HL) 4 1 E9
JP (IX) 8 2 DD E9
JP (IY) 8 2 FD E9
JP C,$NN 10/1 3 DA XX XX
JP M,$NN 10/1 3 FA XX XX
JP NC,$NN 10/1 3 D2 XX XX
JP NZ,$NN 10/1 3 C2 XX XX
JP P,$NN 10/1 3 F2 XX XX
JP PE,$NN 10/1 3 EA XX XX
JP PO,$NN 10/1 3 E2 XX XX
JP Z,$NN 10/1 3 CA XX XX
JR $N+2 12 2 18 XX
JR C,$N+2 12/7 2 38 XX
JR NC,$N+2 12/7 2 30 XX
JR NZ,$N+2 12/7 2 20 XX
JR Z,$N+2 12/7 2 28 XX
LD (BC),A 7 1 02
LD (DE),A 7 1 12
LD (HL),r 7 1 70+rb
LD (HL),N 10 2 36 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
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 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 A,r 4 1 78+rb
LD A,I 9 2 ED 57
LD A,N 7 2 3E 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 B,r 4 1 40+rb
LD B,N 7 2 06 XX
LD BC,(NN) 20 4 ED 4B XX XX
LD BC,NN 10 3 01 XX 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 C,r 4 1 48+rb
LD C,N 7 2 0E 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 D,r 4 1 50+rb
LD D,N 7 2 16 XX
LD DE,(NN) 20 4 ED 5B XX XX
LD DE,NN 10 3 11 XX 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 E,r 4 1 58+rb
LD E,N 7 2 1E 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 H,r 4 1 60+rb
LD H,N 7 2 26 XX
LD HL,(NN) 20 3 2A XX XX
LD HL,NN 10 3 21 XX XX
LD I,A 9 2 ED 47
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 L,(HL) 7 1 6E
LD L,(IX+N) 19 3 DD 6E XX
LD L,(IY+N) 19 3 FD 6E XX
LD L,r 4 1 68+rb
LD L,N 7 2 2E 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
LDD 16 2 ED A8
LDDR 21/1 2 ED B8
LDI 16 2 ED A0
LDIR 21/1 2 ED B0
NEG 8 2 ED 44
NOP 4 1 00
OR (HL) 7 1 B6
OR (IX+N) 19 3 DD B6 XX
OR (IY+N) 19 3 FD B6 XX
OR r 4 1 B0+rb
OR N 7 2 F6 XX
OTDR 21/1 2 ED BB
OTIR 21/1 2 ED B3
OUT (C),A 12 2 ED 79
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
OUT (N),A 11 2 D3 XX
OUTD 16 2 ED AB
OUTI 16 2 ED A3
POP AF 10 1 F1
POP BC 10 1 C1
POP DE 10 1 D1
POP HL 10 1 E1
POP IX 14 2 DD E1
POP IY 14 2 FD E1
PUSH AF 11 1 F5
PUSH BC 11 1 C5
PUSH DE 11 1 D5
PUSH HL 11 1 E5
PUSH IX 15 2 DD E5
PUSH IY 15 2 FD E5
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
RES b,r 8 2 CB 80+8*b+rb
RET 10 1 C9
RET C 11/5 1 D8
RET M 11/5 1 F8
RET NC 11/5 1 D0
RET NZ 11/5 1 C0
RET P 11/5 1 F0
RET PE 11/5 1 E8
RET PO 11/5 1 E0
RET Z 11/5 1 C8
RETI 14 2 ED 4D
RETN 14 2 ED 45
RL (HL) 15 2 CB 16
RL r 8 2 CB 10+rb
RL (IX+N) 23 4 DD CB XX 16
RL (IY+N) 23 4 FD CB XX 16
RLA 4 1 17
RLC (HL) 15 2 CB 06
RLC (IX+N) 23 4 DD CB XX 06
RLC (IY+N) 23 4 FD CB XX 06
RLC r 8 2 CB 00+rb
RLCA 4 1 07
RLD 18 2 ED 6F
RR (HL) 15 2 CB 1E
RR r 8 2 CB 18+rb
RR (IX+N) 23 4 DD CB XX 1E
RR (IY+N) 23 4 FD CB XX 1E
RRA 4 1 1F
RRC (HL) 15 2 CB 0E
RRC (IX+N) 23 4 DD CB XX 0E
RRC (IY+N) 23 4 FD CB XX 0E
RRC r 8 2 CB 08+rb
RRCA 4 1 0F
RRD 18 2 ED 67
RST 0 11 1 C7
RST 8H 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 (HL) 7 1 9E
SBC A,(IX+N) 19 3 DD 9E XX
SBC A,(IY+N) 19 3 FD 9E XX
SBC A,N 7 2 DE XX
SBC r 4 1 98+rb
SBC HL,BC 15 2 ED 42
SBC HL,DE 15 2 ED 52
SBC HL,HL 15 2 ED 62
SBC HL,SP 15 2 ED 72
SCF 4 1 37
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
SET b,r 8 2 CB C0+8*b+rb
SLA (HL) 15 2 CB 26
SLA (IX+N) 23 4 DD CB XX 26
SLA (IY+N) 23 4 FD CB XX 26
SLA r 8 2 CB 20+rb
SRA (HL) 15 2 CB 2E
SRA (IX+N) 23 4 DD CB XX 2E
SRA (IY+N) 23 4 FD CB XX 2E
SRA r 8 2 CB 28+rb
SRL (HL) 15 2 CB 3E
SRL (IX+N) 23 4 DD CB XX 3E
SRL (IY+N) 23 4 FD CB XX 3E
SRL r 8 2 CB 38+rb
SUB (HL) 7 1 96
SUB (IX+N) 19 3 DD 96 XX
SUB (IY+N) 19 3 FD 96 XX
SUB r 4 1 90+rb
SUB N 7 2 D6 XX
XOR (HL) 7 1 AE
XOR (IX+N) 19 3 DD AE XX
XOR (IY+N) 19 3 FD AE XX
XOR r 4 1 A8+rb
XOR N 7 2 EE XX
r means register. Can be A,B,C,D,E,H,L.
Add this to last byte of OP-code:
Reg regbits
A 7
B 0
C 1
D 2
E 3
H 4
L 5
On >LD (IX+N),r< and >LD (IY+N),r< you
add it to the byte before the last.
b means bit. Can be 0-7. Increase the
last byte of OP-code with 8*b.
Used in SET, BIT and RES.
If there is two numbers given at Clock,
then the highest is when the jump is
taken.
Collected by Oscar Lindberg 960324
(offler@skip.adb.gu.se) from:
Z80 pocketbook
Z80 assembly language programming
(
geocities.com/timessquare/alley) (
geocities.com/timessquare)