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28004X的JTAG引脚复用功能

Other Parts Discussed in Thread: UNIFLASH

使用F280049芯片,用四线制的JTAG:TCK、TMS、TDO、TDI,4个JTAG引脚功能专用,软件可以多次正常烧写;软件中将TDO和TDI引脚复用为SCIA功能,第一次可以烧写,第二次用仿真器连接时报错(Error-233),请分析一下是什么原因?

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