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F28377D时钟配置



采用外部时钟20Mhz,经过如下函数InitSysPll(XTAL_OSC,IMULT_20,FMULT_1,PLLCLK_BY_2);倍频为200Mhz。

但实际运行得出的结果总是20MHz,没有倍频,不知道什么原因,定时器如果定时为1s中断,测得结果为10s进入一次中断,求高手指点。