SHARC(21366)  SPI Emulation using Flag pins

Hi,

It would be hard to emulate SPI using Flag pins as you need to maintain timing relationship between clock and the MISO ,MOSI. You will need to toggle the flag pins everytime the Clock and data needs a state change. This becomes cumbersome. You could use the flag pin as a chip select though. To emulate other SPI signals you could use a SPORT.

You could refer to the following application notes for details on such an interface.

EE-248  Interfacing AD7676 ADCs to ADSP-21365 SHARC Processors

EE-244 Interfacing Gated Clocks to ADSP-21065L SHARC Processors

You can find them at the following link.

http://www.analog.com/en/embedded-processing-dsp/sharc/processors/application-notes/resources/index.html

Hope this information helps.