Hi,

I do agree with Bruce ... and do not see how to avoid Timer 1 use.

a 1 sec interrupt interval would be the best for 12 bits ... Interrupt can ask for conversion launching ... and you do what you want in between ...

500 ms interval ( easy w/Timer 1 ...) is perfect for 11 bits ...

In fact, the clock tick would be perfect to initiate each full cycle ...

As I smell, this could be a Datalogger ( so, why use a clock ??? ) ... 30 or 40 ms mini NOT INTERRUPTED for EEPROM writing is to consider too ...

Alain