After a few hours of banging my head against the wall I finally figured it out. The solution was to add pull-up resistors. Duh!!

I'd be happy to provide any additional information.

I'm trying to get my PIC18F8722 working with a LK/VK162-12. Below is a snippet of my code:


IPEN = 0; // Interrupt priorities disabled
PEIE = 1; // enable peripheral interrupts
GIE = 1;
TRISC = 0xff;
PORTC = 0xff;

SSP1STAT = 0x80;
SSP1CON1 = 0x38;
SSP1CON2 = 0x00;
SSP1ADD = 24; //(10MHz/100kHz ...