Mike,

Thanks for your input also.

Timer 1 looked ok but on the PIC18LF1220 the Input for Timer 1 is on RB6 
and RB7. I have already used
these pins for debugging and bootloader coms.

RB0 is used for communications when sending the reading each minute. 
This really leaves INT1 (RB1).

I need the count to continue during the transfer process (Sending the 
data via serial port and waiting for response).

Regards

David
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