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请教一个CPU和CLA的问题??



当我使用CPU的定时器来计数CLA的程序所用的时间,为什么得到的m1为负值

CpuTimer0Regs.TCR.bit.TSS = 0;

CpuTimer0Regs.TCR.bit.TSS = 1;
m1=CpuTimer0Regs.TIM.all;