PIC16F628A keep reseting

vector_135 · Joined: 02 Nov 2006 Posts: 1

I'm a newbie and I'm running a project using PIC16F628A. Occasionally, my firmware will reset by itself. I have tried checking the hardware but there is no problem with the hardware at all. As far as I know, the only way to reset the firmware is by triggering the MCLR pin on the PIC but there is no connection to that pin. Can someone explain to me what I did wrong?

Charlie U · Posted: Sun Nov 12, 2006 7:45 pm

We'll need a bit more information to start working on your problem. Please post the version of your compiler and a small sample program that exhibits the problem and a description of your circuit. We'll need all of the included files as well like the fuses etc. Please use the "code" buttons as you reply. I have been working with the 628A recently, and another of the regulars, PCM Programmer, posts suggestions and great solutions to problems with the 628A as well.

Have you checked to see if you are enabling the WDT? If so, are you clearing it before it "expires" in your program? Also, if you have the Brown out Reset enabled and your power supply falls below the threshold, your processor will reset.

Also, you say that there is no connection to the MCLR pin. Do you have the NOMCLR fuse set?

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

See this thread for links on the "random resets" problem:
http://www.ccsinfo.com/forum/viewtopic.php?t=27638&start=4