-----Original Message-----
From: Gianni <gia.ma.fra@IOL.IT>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: 12 ����ݏ 1999 �., ���ݒ�� 15:21
Subject: bcf/bsf Portx How much reliable?


>   Hi !
>First I'd like to tank all those who replied to my previous question.
>
>I have seen that a lot of questions are concernig bcf/bsf portA/B
>instruction.
>I made 7 project with 16c84 and I never had trouble with these
>operations on portA/B. I'm not a skilled programmer/designer !
>Now the question.
> Under which circumstances is better keep a shadow of the output
> and use movwf port ?

It is better to use shadow register when you have pins that change
from input to output and from output to input. A typical example is I2C.
The zero is output with TRIS=0 and 1 is output with TRIS=1.

i.m.c.
okto7@botev.ttm.bg ICQ: 17221948
http://www.geocities.com/SiliconValley/Network/9276/
Do what have to do, let happens what it wants.

>
>        Tanks
>        Gianni
>