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无法收到dsp发送的数据

用串口通信助手调试 能进接收中断 scitxbuf里也有数据 但是在串口调试助手里没有接收到数据 watchwindow里显示scicregs.scictl2.bit.txrdy=1

scicregs.scirxst.bit.rxrdy=0

中断子程序为:

interrupt void SCIRXINTC_ISR(void)     // SCI-C

{ Uint16 k;

   PieCtrlRegs.PIEACK.bit.ACK8 = 1;

   EINT;

k=ScicRegs.SCIRXBUF.all;

    asm(" nop ");

ScicRegs.SCITXBUF=k;    

    asm(" nop ");  

}