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EPWM模块中的定时器问题

例如 初始化EPWM定时器为10ms周期中断

在 使能该定时器中断后,MCU立刻产生中断,并非等到定时器定时周期才中断。但是仅第一次中断是这样,以后的周期中断是正确的。

请问是否寄存器哪里设置不对,谢谢。