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28335的XCLKOUT,上电未下载程序,输出为3.75MHZ,是硬件出问题了?



上电之后,也没有下载程序,XCLKOUT输出为3.75M正弦波,是不是外围电路出问题了?

  • XCLKOUT can be configured to be either equal or one-half of XTIMCLK by writing to the CLKMODE bit in the XINTFCNF2 register. By default, XCLKOUT is one-half of XTIMCLK, or one-fourth of the CPU clock, SYSCLKOUT.

    XCLKOUT是通过软件配置的,在没有烧写代码的情况下,也就是大部分寄存器默认为0的输出频率