$8 ea (as I only need a couple dozen) is steep!  And these are quite =20
large.  However, following that thought I found others like these...

http://search.digikey.com/us/en/products/MCP7940N-I%2FMS/MCP7940N-I%2FMS-ND=
/2651353

http://search.digikey.com/us/en/products/S-35390A-J8T1G/728-1006-1-ND/16284=
13

The latter appears to have a periodic interrupt feature that perhaps I =20
can use to drive the INT0 pin.  Need to read through the (56-page!) =20
datasheet though.

Cheers,
-Neil.


Quoting IVP <joecolquitt@clear.net.nz>:

>> Have you considered simply using a seperate RTC chip to
>> track the time?
>
> There are several accurate low-power I2C/SPI RTC ICs
>
> eg http://www.maxim-ic.com/products/timers/ds3234.cfm
>
> @ Mouser http://nz.mouser.com/Search/Refine.aspx?Keyword=3DDS3234
>
> (re-directed to NZ site - NZ$1 =3D US$0.82.6)
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>



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