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SCI sending problem - MC9S12XS128 

Question asked by 杜太磊 杜 on Feb 24, 2017



I have some problems with my freescale controller.


When I debug  the SCI program, the value of the SCI1DRL register is always 0;for example,after runing "SCI1DRL = 0x55;" the value of SCI1DRL is 0x00,and the value of SCI1SR1_TDRE is always 1,using  the serial port debugging assistant, the value of I get is 0x85.

 When I run "SCI1DRL = 0xaa;/*SCI1DRL = other data;*/" ,the value of I get is wrong.


I want to know how to solve the problem.

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