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CCS/TMS320F2812: about SCI

Part Number: TMS320F2812

Tool/software: Code Composer Studio

Hi,    whether  ”SciaRegs.SCICCR.bit.LOOPBKENA=0;” or  ”SciaRegs.SCICCR.bit.LOOPBKENA=1;”   when the PC send data to 2812,  the PC receives the same data always.  then the regist SCIRXBUF of the 2812 has no data to receive.   why? 

the flash is locked,  so  I  debug it in SRAM.