Hardware I2C

[skimask]

I am using ASM interrupts, as some of them are time critical. I also would prefer not to turn off the interrupts during I2C usage, as I don't want to miss any interrupt events.

I just found this on MicroChip's site. It looks helpful: http://ww1.microchip.com/downloads/e...tes/00989A.pdf

Looks helpful, but I'd suggest reading that other site on I2C and learn a bit about what has to happen behind the scenes for an I2C transaction to be successful.
I2C isn't like serial. You can't really just 'plug a byte' and assume the receiver got it (well, you can for a few things). There's a few steps involved (start, control, address, data, stop/ack/nak, etc). Some under PIC control, some under user control.

How time critical are those 'time critical' interrupts?
Keep in mind that I2C is a lot faster than 9600 baud serial...