I am using the 2812 to get data from an ADC using SPI. The ADC sends a data ready (an interrupt for the 2812) and the 2812 responds with a few dummy writes to receive the data from the ADC. The questions are: I'm actually using only 2 pins of the SPI to receive my data: the clock and SOMI . Is it possible to keep the SPISIMO and SPISTEA as a general purpose I/O's? Do I need to configure the Direction Register in the case of the CLK (out) and the SOMI (in) or just configuring the MUX register for those two pins does the trick?
Regards