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F28M35H52C1- Read Data from SSI Data Register

Thirumoorthy R
Expert 1460 points

Hi 

 I am using above CPU. I programmed SSI as SPI. First-of-all i configured my slave device ( Write throurh SPI then read Dummy data from SSI_DR ). Then again i try to read the Data from slave device. Whenever i am sending a Read command with dummy data( 8+ 8 bit), my slave device returns the DATA. I keep tracking the Rx pin. So in the oscilloscope i can get correct value.

My SSI_DR register also having the same value at the moment. But immediate next step my data changed to 0xFFFF. So i am always getting 0xFFFF only. 

I dont know why this is changed like that. 

According to the Technical Datasheet Rx FIFO data should clear only after reading,...

Please help me to figure out this issue..

Thanks in Advance

Thirumoorthy.R