Luis Moreira wrote:
> I am using a 16F877A, I know it as something to do with the SUBxx
> instruction but can not get my head around it. It should be simple but
> I can not get it.

Note that the description of the SUBxx instructions
in the data sheet for the 16F877A are a bit short.

Download the "Midrange ref manual". There, right in the
descriptions of the SUBxx instructions, are examples of
all three cases (a<b, a=b and a>b) and the status of the
Z and C flags in each case.

And in general, the descriptions of the instruction in the
ref manual are better then those found i the model
specific data sheet(s). A *few* data sheets has the same
descriptions as in the ref manual, the 16F628A is one of
them.


Jan-Erik.

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