Program Flow Instructions

How to decode program flow instructions from binary

Opcode format
7	6	5	4	3	2	1	0
0	0	0	1	D	0	0	0
e-2

0	0	1	cc		0	0	0	JR
e-2

1	1	0	0	0	0	1	1	JP
7	nn						0
15	nn						8

1	1	0	0	1	0	0	1	RET

1	1	0	0	1	1	0	1	CALL
7	nn						0
15	nn						8

1	1	1	0	1	0	0	1	JP (HL)

1	1	ccc			0	0	0	RET

1	1	ccc			0	1	0	JP
7	nn						0
15	nn						8

1	1	ccc			1	0	0	CALL
7	nn						0
15	nn						8

1	1	b			1	1	1	RST

Conditions
cc	ccc	Abbrev	Condition	Flag
00	000	NZ	Non Zero	Z
01	001	Z	Zero	Z
10	010	NC	No Carry	C
11	011	C	Carry	C
	100	PO	Parity Odd	P/V
	101	PE	Parity Even	P/V
	110	P	Sign Positive	S
	111	M	Sign Negative	S

Bits
Value		b
0		000
1		001
2		010
3		011
4		100
5		101
6		110
7		111

D
Instruction	D
DJNZ	0
JR	1

Last modified November 12, 2021: Change shortcode for the decoding tables (cd015a3)