On Thu, 18 May 1995, Jordanis Haralampopoulos wrote:

> Correct, there is no I2C on the 16C84. But for real time clock why
> don't you try the Dallas Semiconductors TimeInaCan(DS1494 TIC). It
> takes only one I/O pin and some code to communicate with it.
> Except if you are looking for something that has a wake-up
> function..... to wake-up a sleeping uP......

I have used the TIC with a 16C84 in a design.  I wrote the support code
for the 1 wire protocol one night over a six pack.  So it's not a major
time investment in software.  But it is nice to have a scope available so
you can see if there is a hardware (i.e. pull-up resistor) or software
i.e. timing or TRIS register problem.

I wrote the routine in C (CCS compiler) -- I know people on this list
think that is a sin, but it simplified the job in my opinion.  I can
send you the C (and the compiler generated assembler) if you would like.

Jason