>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 25 January 2006 07:09
>To: piclist@mit.edu
>Subject: [PIC] SPI question
>
>
>I am using the SPI module on the 16f877a to interface to a 
>ADC;therefore the SDO pin is of no use in this interface as 
>the PIC will only be receiving data from the ADC. The 
>datasheet states  "If the SPI is only going to receive, the 
>SDO output could be disabled (programmed as an input)."
>
>Does this mean that in the above case,SDO can be used as only 
>a general purpose INPUT and not as a general purpose OUTPUT? 
>Is there any way it can be made to function as a general 
>purpose output even while using the SPI module?

The answer is no because the MSSP peripheral overrides the port data latch.  You can use it as a digital input or as SDO with the MSSP configured for SPI.

Regards

Mike

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