Hi,

Could you post a picture of your HW and maybe a simple schematic. There must be a reson for the PIC not to work properly and we all wants to help.

A simple schematic will help to provide us an understanding of what levels you have where and if we compare these with what we expect them to be we might be able to spot the problem.

What does RB6 and RB7 do after you have ISCP-programmed the PIC and disconnected the programmer? I have seen of the 877A that if RB6 and RB7 are held at an unfourtunate level/timing the PIC will refuse to start up properly. I suspect this to be related to the VDD rise and then the PIC will try to enter programming mode even when a programmer is not connected.

I have 2 877A:s connecting with each other using a cable on RB6 and RB7. And if I set the pins from one PIC in a special way the other PIC will refuse to power up.

Are there any power applied to any pin of the PIC before VDD is applied?


/me