> Is there any existing routines for running a 16f84 as an i2c slave ?

Probably.

> If not, does it mean it's impossible to do ?

It's definitely possible, although doing a software slave is harder than
doing a software master because the master owns the clock.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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