I'm using the MSSP module on a 18F2221 as an I2C slave. The datasheet 
mentions that SMBus specific inputs can be enabled
when the SMBus Select bit (SSPSTAT,CKE) is set, but it doesn't say how this 
affects the input voltage levels.

Does anyone know what the levels change to?

According to version 2.0 of the SMBus spec http://smbus.org/specs/ , input 
high is minimum 2.1V and input low is maximum 0.8V, but they might not 
necessarily be the values the PIC uses.

Thanks in advance,

James







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