What would probably be the likely cause of the output bouncing on the lower 4 bits, bits 0,1,2,3, but has good stability on the upper bits. I'm using a junk box Pic 16f807 with one input line to AN0 which is being fed from the output of a LM324 op amp wired as a non-inverting dc gain. The signal to the op amp is coming directly from a thermocouple.
If it's do to noise why does it only bounce on the lower bits?
Pj