I use a 32768 Khz 'watch' xtal on the T1OSI/T1OSO pins of an 18F452. Better
still, the Dallas temp compensated part, the DS32KHZ.

Peter Moreton


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of EBoggs@AOL.COM
> Sent: 23 June 2004 20:18
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [PIC]:Crystal Timebase
>
>
> Hi,
>   Does anyone know of a better way to obtain precision
> accuracy using a PIC as a stopwatch. I was using an Epson
> 16-pin DIP crystal oscillator/programmable divider outputting
> 100 HZ. They have discontinued the chip and my options are to
> use a 1KHZ crystal oscillator and divide it by 100 (2chips)
> or a 1MHZ AT crystal and divide it by 10000 (cd4059 ic
> 24-pin), etc. I was running this in the int. pin and simply
> counting hundreds of a second.
>
>  Thanks, ed
>
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