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Appendix
DJNZ
Decrement and jump if not zero
| Description |
The DJNZ instruction decrements the byte indicated by the first operand and, if the resulting value is not zero, branches to the address specified in the second operand.
When this instruction is used to modify an output port, the value used as the port data is read from the output data latch, not the input pins of the port. |
|
| See Also | CJNE |
Note| DJNZ direct_Address, relative_offset | |||||||
|
| Bytes | 3 | |
| Cycles | 2 | |
| Encoding | 11010101, direct, relative_offset | |
| Operation |
DJNZ PC = PC + 2 (direct_address) = (direct_address) - 1 IF (direct_address) <> 0 PC = PC + relative_offset |
|
| Example |
DJNZ 40h, LABEL |
| DJNZ Rn, relative_offset | |||||||
|
| Bytes | 2 | |
| Cycles | 2 | |
| Encoding | 11011nnn, relative_offset | |
| Operation |
DJNZ PC = PC + 2 Rn = Rn - 1 IF Rn <> 0 PC = PC + relative_offset |
|
| Example |
DJNZ R6, LABEL |
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