*>Aaron Sliwenkski <aarons@IHS.COM> writes:
*>> *>I am developing a 16C84 PIC based product with and RS-232 interface and a
*>> *>Real-Time Clock.  Any hints, suggestions or recommendations?
*>> *>
*>> *>Dan Garlen
*>>
*>> For the clock:  Philips PCF8573 or PCF8583 - Since the `84 has I2C
*>> built in these should work fine.
*>
*>The '84 has I2C built in? I don't think so. If you want this, you
*>must implement protocols in software, and there's no I2C support in
*>hardware either. This does take up a certain amount of the (limited)
*>memory, of course....
*>
*>Richard H

You're right, I was thinking of the `74, but if one wants to use an
external clock the two wire interface is superior to any of the parallel
approaches that suck up a bunch more pins that could be put to better use.
I agree the `84 is a bit cramped for code space in comparison to the `74
but the code to implement the interface protocol is very simple and may
be worth the memory.