In order to experiment with PICS I used a PIC16F684 and wrote a flashing led program. However for our actual design we need a PIC with more pins (PIC16F684 has 14 pins) to handle the LCD that will be part of the front end of our system. We decided to use a PIC18F4331, but ran into some problems with programing resulting in a message "Programming failed at Program Memory address 0x000000." After much work we realized that AVDD and AVSS must be connected since they provide a reference voltage for the A/D converter. After fixing this we were finally able to write to the PIC.
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