Bugger, forgot the tag the first time. I can see todays not going to be a
great day :-(


Hi everyone,

I need to subtract 1 from a byte on the 18F6720, and I'm confused by the
fact that there seem to be four instructions to subtract in the instruction
set.

There is:

SUBFWB  Subtract f from W with borrow

SUBLW           Subtract W from literal

SUBWF           Subtract W from f

SUBWFB  Subtract W from f with Borrow

I have a byte called New_Low_Byte, and need to subtract 1 from it. I'm
confused as to the fastest way to do it.

Any help would be great.

Thanks

Graham

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