>Just another question : someone on the list (I can't remember who) advise
>me to use new pic with on-board i2c (called SSI module i think) interface.
>I can say it's my backup solutions, but I'm thinking about it. Is this
>on-board interface easy to use or is it a good headache provider ?

The 16F628 is available in a package which is pinout compatible with the
16F84, so my recommendation would be to use the same pins if you insist on
doing a software implementation in the 16F84. As for ease of doing it, I am
about to find out, using the F876 parts.

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