AVR-Chat

----- Original Message ----- 
From: "oldhat_owen" <oldboot@bigpond.com>
To: <AVR-Chat@yahoogroups.com>
Sent: Thursday, September 07, 2006 3:06 PM
Subject: [AVR-Chat] OT HC595 AND PIC GLITCHES


>I know this is perhaps a bit off topic but I have several boards with
> PIC16F877 processors driving an HC595 shift register and the output
> pins from the pic driving the HC595 are virtually all glitches.
>
> It is hard to pick up a high or low as such on the logic analyser
> other outputs seem ok, has anyone any idea what may be causing this.
>
> And yes I do not like pic's I normally use AVR'S.

Perhaps you are having read/modify/write problems, are you using the bit 
manipulation instructions?

Leon