Z-80 Instructions: Part F.

Z-80 Instructions: Main menu. (Access Key="M".)
Previous: Part E: GENERAL PURPOSE ARITHMETIC AND CPU CONTROL GROUPS (Access Key = "E")
Next: Part G: ROTATE AND SHIFT GROUP (Access Key = "G")

16-BIT ARITHMETIC GROUP

Mnemonic Symbolic
Operation Flags OP-Code No. of
Bytes No. of
M Cycles No. of
T Cycles
Comments

C Z P/V S N H 76 543 210

ADD HL,ss HL ← HL + ss ↕ • • • 0 X 00 ss1 001 1 3 11 ss    Reg.
00    BC
01    DE
10    HL
11    SP

ADC HL,ss HL ← HL + ss + CY ↕ ↕ V ↕ 0 X 11 101 101
01 ss1 010 2 4 15

SBC HL,ss HL ← HL - ss - CY ↕ ↕ V ↕ 0 X 11 101 101
01 ss0 010 2 4 15

ADD IX,pp IX ← IX + pp ↕ • • • 0 X 11 011 101
00 pp1 001 2 4 15 pp    Reg.
00    BC
01    DE
10    IX
11    SP

ADD IY,rr IY ← IY + pp ↕ • • • 0 X 11 111 101
00 pp1 001 2 4 15 rr    Reg.
00    BC
01    DE
10    IY
11    SP

INC ss ss ← ss + 1 • • • • • • 00 ss0 011 1 1 6 ss as above

INC IX IX ← IX + 1 • • • • • • 11 011 101
00 100 011 2 2 10

INC IY IY ← IY + 1 • • • • • • 11 111 101
00 100 011 2 2 10

DEC ss ss ← ss - 1 • • • • • • 00 ss1 011 1 1 6 ss as above

DEC IX IX ← IX + 1 • • • • • • 11 011 101
00 101 011 2 2 10

DEC IY IY ← IY + 1 • • • • • • 11 111 101
00 101 011 2 2 10

16-BIT ARITHMETIC GROUP
Mnemonic	Symbolic Operation	Flags	OP-Code	No. of Bytes	No. of M Cycles	No. of T Cycles	Comments
ADD HL,ss	HL ← HL + ss	↕	•	•	•	0	X	00 ss1 001	1	3	11	ss Reg. 00 BC 01 DE 10 HL 11 SP
ADC HL,ss	HL ← HL + ss + CY	↕	↕	V	↕	0	X	11 101 101 01 ss1 010	2	4	15
SBC HL,ss	HL ← HL - ss - CY	↕	↕	V	↕	0	X	11 101 101 01 ss0 010	2	4	15
ADD IX,pp	IX ← IX + pp	↕	•	•	•	0	X	11 011 101 00 pp1 001	2	4	15	pp Reg. 00 BC 01 DE 10 IX 11 SP
ADD IY,rr	IY ← IY + pp	↕	•	•	•	0	X	11 111 101 00 pp1 001	2	4	15	rr Reg. 00 BC 01 DE 10 IY 11 SP
INC ss	ss ← ss + 1	•	•	•	•	•	•	00 ss0 011	1	1	6	ss as above
INC IX	IX ← IX + 1	•	•	•	•	•	•	11 011 101 00 100 011	2	2	10
INC IY	IY ← IY + 1	•	•	•	•	•	•	11 111 101 00 100 011	2	2	10
DEC ss	ss ← ss - 1	•	•	•	•	•	•	00 ss1 011	1	1	6	ss as above
DEC IX	IX ← IX + 1	•	•	•	•	•	•	11 011 101 00 101 011	2	2	10
DEC IY	IY ← IY + 1	•	•	•	•	•	•	11 111 101 00 101 011	2	2	10

Notes: ss is any of the register pairs BC, DE, HL, SP.

pp is any of the register pairs BC, DE, IX, SP.

rr is any of the register pairs BC, DE, IY, SP.

Flag Notation: • = flag not affected, 0 = flag reset, 1 = flag set, X = flag is unknown,

↕ = flag is affected according to the result of the operation.

Z-80 Instructions: Main menu. (Access Key="M".)
Previous: Part E: GENERAL PURPOSE ARITHMETIC AND CPU CONTROL GROUPS (Access Key = "E")
Next: Part G: ROTATE AND SHIFT GROUP (Access Key = "G")

Notes:	ss is any of the register pairs BC, DE, HL, SP.
	pp is any of the register pairs BC, DE, IX, SP.
	rr is any of the register pairs BC, DE, IY, SP.

Flag Notation:	• = flag not affected, 0 = flag reset, 1 = flag set, X = flag is unknown,
	↕ = flag is affected according to the result of the operation.