problems on power up of PIC

[BobK]

Hi dmairspotter,

I think you may want to put a few more capacitors on your circuit. Put a 10uF on both sides of the voltage regulator along with .1uf caps. Put a .1uf from MCLR to ground. Then try your power off and on again and see if this doesn't clear things up for you. It probably wouldn't hurt to also put a 100uf on th inout side of the voltage regulator also.

BobK

[Pic_User]

Hi dmairspotter,

Do you think the power-up sequence might be accidentally putting the 16F876A into the "Low Voltage Program" mode. Then programming garbage into the PIC.

Make sure to turn the "Low Voltage Program" option off when you program the 16F876A

PIC16F87XA FLASH Memory Programming Specification
http://ww1.microchip.com/downloads/e...Doc/39589b.pdf

See: 2.4.1 LOW VOLTAGE ICSP PROGRAMMING MODE
When RB3 is driven to VDD from ground, the PIC16F87XA device enters Programming mode.

-Adam-