On Thu, 30 Apr 1998 16:29:33 +0100 Michael Hearn
<michael.hearn@FALLIBROOME.CHESHIRE.SCH.UK> writes:
>Dear all,
>
>I need to NOT a number for a control project my school is doing.
>However,
>the instruction set for the PIC chip does not have a NOT.

Yes it does; the instruction is 'comf' (Complement F).  It inverts all
bits in a byte.  It is very similar to 'clrf' and 'movf' in that the
result can be sent to W or back to RAM.

Of course you can also complement using xor.  Xoring with 0xff inverts
all bits.  This is useful to complement ('NOT') W without needing to copy
to RAM first.  Just use xorlw h'ff' (Hexadecimal FF is binary 11111111).

(W= 01011100 before)
        xorlw   h'ff'
(Now W = 10100011)



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