eZ80 CPU - writeframeofmind.biz

eZ80 CPU
User Manual
38
DJNZ d
Decrement B Jump not Zero
Operation
Description
B ← B – 1
If B ≠ 0
PC ← PC + d
The B register decrements by 1. If the resultant value in register B is not zero,
the two’s complement displacement d is added to the value of the program
counter. The jump is measured from the address of the instruction Op Code
following this instruction.
Condition Bits Affected
None
Mnemonic Operands ADL Mode Cycles Op Codes
DJNZ d X 2/4 10, dd
UM007701-1100