> I need to count six fast (up to 30 kHz or so) pulse streams.  I have
> to be very low power, about 50 uA average, so I can't just crank the
> clock on a PIC and sample 6 port pins.   Before, to count one pulse
> stream, I used the TMR0 in external clocking mode, and read it
> periodically. Which worked great.
>
> Now what I need are 6 TMR0s on one PIC.  I've used Intel 82C54
> counters before, but they only come in byte wide bus interfaces,

Use a PIC's (16C55 or others) 8 lines of say port B as a bus and the
port A for control like RD, WR, etc.I used a 16C55 for 8250 and it
worked great.

> they have some stupid initialization problems.

Got to live with it.

>  Anybody know of a
> counter or counter/timer chip that is very low power and uses some
> kind of serial interface?

Have a counter interfaced to a shift register. Have 6 of then for 6
counters and read then serially. Crazy !!

> TIA,
>
> ------------
> Barry King
> Engineering Manager
> NRG Systems "Measuring the Wind's Energy"
> Hinesburg, Vermont, USA
> barry@nrgsystems.com
> "The witty saying has been deleted due to limited EPROM space"



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