Hi Jan
thanks for your help, Steve as mentioned that also, and by looking at the
datasheet I found what I wanted.
thank you all for your help.
when I manage to finish this project I will post it on PICLIST for anybody
to use.
best regards
                Luis

-----Original Message-----
From: Jan-Erik Soderholm XA (TN/PAC)
[mailto:jan-erik.xa.soderholm@ERICSSON.COM]
Sent: 27 October 2003 12:23
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: how to compare to numbers


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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