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TMS320F28377D: CCS expressions监控变量窗口的数值显示值和真实值貌似不一致

Part Number: TMS320F28377D

我在CCS expressions中观察test15(long型,且程序中对其赋值只有这一处),大多数情况下是0,正负1变化,偶尔能看到正负65535 65536的

但是est16 和test17却一直为0,说明没有超过20000,打断电也没进去,这样的话就说明真实没有出现正负65535 65536

请问该如何解释?谢谢