Is there a compelling reason you wake up every second?

If your sampling rate is low (one sample every minute is where I start),
why not use the Timer1 prescaler to only wake up every 4 seconds, and
increment the time counter by 4 instead of by 1.  Not only does it save
battery, it's also easier to code, since you don't worry about writing to
TMR1H.

Mike H.

>James NickSears wrote:
>
>I am using a 16F877 uC with a Maxim voltage reference IC to take samples
>from an IC temp sensor in a stainless steel pipe nipple with both ends
>capped buried in a large compost pile.  The 877 sleeps most of the time,
>waking up once per second to increment time and see if a sample needs to be
>taken, etc.

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