Russell Bull wrote:
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DJNZ - decrement and jump if not zero.

if the var is already 0
dec = 0xff
jump

I would say that if the var is 0 you are looping 256 times if it is 0ffH you will loop 255 times, but both will work, you will not be stuck in loop. When var is 1 and decremented it becomes zero and we fall through.

Anders