Hi Donatas,

"10kbit/s", now we can see finally, what you want.

But why I2C (100kHz standard or 400kHz fast) too slow ?

If you have many pins, you can use the old HPIB (also named GPIB or IEEE). It have 8 data lines and 8 control lines. It can be made in software or with controllers e.g. NEC7210, TMS9914.


Peter