Re: [uCsimm] I2C

From: Andrew Kohlsmith (
Date: Wed Oct 25 2000 - 12:44:30 EDT

> Does anyone know if ucsimm SPI port is compatible with
> I2C bus ?

I2C and SPI are competing standards. No they're not compatible. However it
is pretty easy to bit-bang I2C; just use open-collector outputs (or drive
the SDA and SCL lines with NPN transistors -- float the collectors to +V and
connect the emitters to ground; the output will be taken from the junction
of the collector and the resistor and the output will be the opposite of
what you spit out to the port.

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