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LP-MSP430FR2476: CCS单步调试时 变量值 会随机变化?

Part Number: LP-MSP430FR2476

您好,

我在单步调试时发现,我的两个变量,TXByteCtrl--命令字节计数器, RXByteCtrl--接收字节计数器,会随机变化?比如,TXByteCtrl = 2;RXByteCtrl  = 9; 用自减XXByteCtrl --去控制,减到几次后,就突然增大了,但还是可以继续--,但已经没有意义了,

请问,这是怎么回事?定义为uint8_t, int8_t, int16_t, uint16_t, 都一样,

谢谢!