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TMS320F2800157: PWM不发波的问题

Part Number: TMS320F2800157

碰到一个问题

PWM一开始正常发波,调节负载,让输出电流变大,就会偶发性的导致PWM不发波(常高或常低)

根据各种现象分析,初步怀疑是MCU的时钟混乱了

请问有什么办法可以检测到MCU的时钟是否正常?