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TMS320F28335: 上电后复位信号问题

Part Number: TMS320F28335


DSP上电后,其复位引脚会产生周期约为4ms的低电平脉冲信号,如图2通道所示,根据数据手册,其可能由默认的看门狗电路产生,其中低电平脉冲时间为512个时钟信号,可以和数据手册相对应,那4ms左右的复位周期是如何计算得到?这一部分未在数据手册中看到