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How to configure some pins as general purpose input or output in C5510a?

Shanjie Chen
Prodigy 110 points

Hi,

       I want to use C5510a DSK to read external data from AD7813. The AD7813 has 9 output pins( 8 data output pins and 1 busy signal pin) and 3 control signal pins(CS  RD CONVST),  but the C5510a has only 8 GPIO(general purpose IO) pins, I still need another 4 IO pins.

       In the datasheet of C5510a, I know some pins, such as CLKR, DR, FSR, CLKX, DX, can be configured as general purpose input or output, but I don't know how to configure these pins as input/output?  And how to read/write the data of these configured pins, using what functions???

      Thanks very much and look forward to your help.