problems on power up of PIC

[Acetronics2]

Hi all

I have a project using the PIC 16F876A. I'm having a problem with that appears to be the program memory resetting or erasing randomly on power up.


Any ideas or power supply design tips greatly appreciated! This problem is a project killer!

Thanks

Hi,Dmair

I use Pics abord R/C systems ... supply is always "not so good , yeah ..." I then solved the problem with an external Brown out device like MC 33064P5 ...

No more startup, cutout or "glitches" problems ... cause reset is strongly tied low until Power is in the correct range !!!

In your explanation ... I didn't see any "big" capacitor ( > 200µF )... between Reg and PIC. ... just an idea ...

Alain

[dmairspotter]

Thanks for all the input. I did try some small (.1-.2 mF) caps at the in and out of the reg. On the in side, seemed to help. On the out, seemed to aggravate the problem. I will check the LV programming and try adding some more/bigger caps. Thanks again.