>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]=20
>Sent: 01 September 2005 17:08
>To: 'Microcontroller discussion list - Public.'
>Subject: [PIC] Pic16f84a vs pic16f628
>
>
>Hi all,
>
>At time I have no way to solve a little problem using a=20
>pic16f628. The original program was working well in a=20
>pic16f84a, but when I change the headers and compile it for a=20
>pic16f628 never works.
>
>The program is simple, at start time; it turns on 3 leds one=20
>by one with a delay of 20 mS between each one, so after 60mS=20
>the 3 leds must be ON.
>
>        +---------------------------------------
>LED1 ---!    +----------------------------------
>LED2 --------!     *----------------------------
>LED2 --------------!
>
>After 1 second, the sequence must be to turn OFF each led with=20
>a delay of 10 mS between each on.
>
>With a PIC16F84A it works well but when I use a pic16f628, the=20
>leds never be turned to ON in sequence.
>
>        +----*
>LED1 ---!    !----------------------------------
>             +-----+=20
>LED2 --------!     !----------------------------
>                   +----+
>LED2 --------------!    !-----------------------
>
>Question is: What=B4s wrong?

Almost certainly you have forgotten to disable the comparator, so the ana=
log pins always read back zero.  This means if you perform a bsf on the p=
ort, all the other pins will get set to zero.

Regards

Mike

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