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430F248串口复位

Other Parts Discussed in Thread: MSP430F248

现板子上有2个MSP430F248芯片,简称A和B。A和B通过串口向连接,并且A的一个IO口通过控制一个三极管去实现对B的复位。现在发现当A死机时,A的外部看门一直有200ms的方波,但是A一直不复位。当直接对B复位时,死机的A也会立即复位,请问这是什么情况。