Program Flow Instructions
How to decode program flow instructions from binary
Table of Contents
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 | 8 |
| |
| 1 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | RET |
| |
| 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | CALL |
| 7 | nn | 0 |
| 15 | 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 | 8 |
| |
| 1 | 1 | ccc | 1 | 0 | 0 | CALL |
| 7 | nn | 0 |
| 15 | 8 |
| |
| 1 | 1 | b | 1 | 1 | 1 | RST |
Conditions
| cc | ccc | Abbrev |
Condition |
Flag |
|---|
| 00 | 000 | NZ |
Non Zero |
Z |
| 01 | 001 | Z |
Zero |
| 10 | 010 | NC |
No Carry |
C |
| 11 | 011 | C |
Carry |
| | 100 |
PO |
Parity Odd |
P/V |
| 101 |
PE |
Parity Even |
| 110 |
P |
Sign Positive |
S |
| 111 |
M |
Sign Negative |
Bits
| Value | b |
| 0 | 000 |
| 1 | 001 |
| 2 | 010 |
| 3 | 011 |
| 4 | 100 |
| 5 | 101 |
| 6 | 110 |
| 7 | 111 |