Accurate Sleep Mode

Hi, Apart from NAP and SLEEP which use the watchdog as the counter,
is there a way of incrementing a counter based on the xtal clock and using as little power as possible ?
I am trying to maintain a reasonable accurate clock timer, whilts in low poer mode.
thnks

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Originally Posted by Peter1960

Hi, Apart from NAP and SLEEP which use the watchdog as the counter, is there a way of incrementing a counter based on the xtal clock and using as little power as possible ? I am trying to maintain a reasonable accurate clock timer, whilts in low poer mode. thnks

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32khz xtal on TMR1 with a prescale kicking an interrupt which increments a counter?
We don't know which PIC you got.

Hi,

I am using a 16F676 with a 4mhz resonator.

Have to use resonator for serial port.

Quote:

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Originally Posted by Peter1960

Hi,
I am using a 16F676 with a 4mhz resonator.
Have to use resonator for serial port.

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Datasheet section 5.5, using a 32khz crystal across OSC1 & OSC2 feeding TMR1 and incrementing your counters and sleeping in the meanwhile. Run the PIC off the internal 4mhz.