I have also had this problem.  The reset pin seems a little dodgy on the
f877.  You are right - RESET will restart execution at 0000h. Try a 15 to
25ms delay at the START of your code execution - this often helps and is
recommended in the PIC datasheet.

Are you using ICSP ? - if you are it often helps to tie DATIO, CLKOUT, and
LOW to Gnd when not in use for ICSP of for some other function on the port.
Also tie the ICSP 3 signal lines with a 4k7 pullups to +5V - this port is
extremely sensitive to noise - and leaving the pins floating can often stop
the PIC from starting properly.

Regards


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Arno Cammans
Sent: Thursday, 6 February 2003 12:29 pm
To: PICLIST@MITVMA.MIT.EDU
Subject: pic16F877 Reset question


Hi,

I have a weird problem with my pic16f877. On power-up everything runs
fine, but as soon as i reset the board doesn't seem to do anything
anymore. MCLR is connected to a 10k pull-up and a resetbutton which is
tied to the ground, so that should work fine. As far as i know, on reset
the program should start at 0x000 .. or am i wrong ?

Thanks,

Arno



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