hoi everybody,

Just found this site and i already love it :).

About I2C with a standard 80C52 derivate : bit per bit generating an I2C protocol is very complicated, when you want to make it 100% easy to use and want to build in some errorhandling in case a spike desturbed the communication on the I2C bus. (retry's etc...) It uses a lot of memory and while the microntroller is working on that, it waste time and can not do something else.
Therefore a 87C652 / 654 from Philips is a better choice. It has an stand alone I2C bus interface, similar to the serial bus interface. Easy to use !
I wrote a routine (hex format) to use for the 24C64 E2PROM, and wrote others to communicate with other microcontrollers.

Filip.