Z-80 Instructions: Part I.

Z-80 Instructions: Main menu. (Access Key="M".)
Previous: Part H: BIT SET, RESET, AND TEST GROUP (Access Key = "H")
Next: Part J: CALL AND RETURN GROUP (Access Key = "J")

JUMP 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

JP nn PC ← nn • • • • • • 11 000 011
← n →
← n → 3 3 10

JP cc,nn If condition cc
is true PC ← nn,
otherwise
contiue • • • • • • 11  cc  010
← n →
← n → 3 3 10 cc    Condition
000   NZ non zero
001   Z   zero
010   NC non carry
011   C   carry
100   PO parity odd
101   PE parity even
110   P   sign positive
111   M   sign negative

JR e PC ← PC + e • • • • • • 00 011 000
← e-2 → 2 3 12

JR C,e If C = 0,
continue
If C = 1,
PC ← PC + e • • • • • • 00 111 000
← e-2 → 2
2 2
3 7
12 If condition not met
If condition is met

JR NC,e If C = 1,
continue
If C = 0,
PC ← PC + e • • • • • • 00 110 000
← e-2 → 2
2 2
3 7
12 If condition not met
If condition is met

JR Z,e If Z = 0,
continue
If Z = 1,
PC ← PC + e • • • • • • 00 101 000
← e-2 → 2
2 2
3 7
12 If condition not met
If condition is met

JR NZ,e If Z = 1,
continue
If Z = 0,
PC ← PC + e • • • • • • 00 100 000
← e-2 → 2
2 2
3 7
12 If condition not met
If condition is met

JP (HL) PC ← HL • • • • • • 11 101 001 1 1 4

JP (IX) PC ← IX • • • • • • 11 011 101
11 101 001 2 2 8

JP (IY) PC ← IY • • • • • • 11 111 101
11 101 001 2 2 8

DJNZ e B ← B - 1
If B = 0,
continue
If B ≠ 0,
PC ← PC + e • • • • • • 00 010 000
← e-2 → 2
2 2
3 8
13 If B = 0
If B ≠ 0

JUMP GROUP
Mnemonic	Symbolic Operation	Flags	OP-Code	No. of Bytes	No. of M Cycles	No. of T Cycles	Comments
JP nn	PC ← nn	•	•	•	•	•	•	11 000 011 ← n → ← n →	3	3	10
JP cc,nn	If condition cc is true PC ← nn, otherwise contiue	•	•	•	•	•	•	11 cc 010 ← n → ← n →	3	3	10	cc Condition 000 NZ non zero 001 Z zero 010 NC non carry 011 C carry 100 PO parity odd 101 PE parity even 110 P sign positive 111 M sign negative
JR e	PC ← PC + e	•	•	•	•	•	•	00 011 000 ← e-2 →	2	3	12
JR C,e	If C = 0, continue If C = 1, PC ← PC + e	•	•	•	•	•	•	00 111 000 ← e-2 →	2 2	2 3	7 12	If condition not met If condition is met
JR NC,e	If C = 1, continue If C = 0, PC ← PC + e	•	•	•	•	•	•	00 110 000 ← e-2 →	2 2	2 3	7 12	If condition not met If condition is met
JR Z,e	If Z = 0, continue If Z = 1, PC ← PC + e	•	•	•	•	•	•	00 101 000 ← e-2 →	2 2	2 3	7 12	If condition not met If condition is met
JR NZ,e	If Z = 1, continue If Z = 0, PC ← PC + e	•	•	•	•	•	•	00 100 000 ← e-2 →	2 2	2 3	7 12	If condition not met If condition is met
JP (HL)	PC ← HL	•	•	•	•	•	•	11 101 001	1	1	4
JP (IX)	PC ← IX	•	•	•	•	•	•	11 011 101 11 101 001	2	2	8
JP (IY)	PC ← IY	•	•	•	•	•	•	11 111 101 11 101 001	2	2	8
DJNZ e	B ← B - 1 If B = 0, continue If B ≠ 0, PC ← PC + e	•	•	•	•	•	•	00 010 000 ← e-2 →	2 2	2 3	8 13	If B = 0 If B ≠ 0

Notes: e represents the extension in the relative addressing mode.

e is a signed two's complement number in the range <-126,129>.

e-2 in the op-code provides an effective address of PC+e as PC is
incremented by 2 prior to the addition of e.

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 H: BIT SET, RESET, AND TEST GROUP (Access Key = "H")
Next: Part J: CALL AND RETURN GROUP (Access Key = "J")

Notes:	e represents the extension in the relative addressing mode.
	e is a signed two's complement number in the range <-126,129>.
	e-2 in the op-code provides an effective address of PC+e as PC is incremented by 2 prior to the addition of e.

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.