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我们目前用的是DSP28069 看手册主频是90Mhz，我可以用到60Mhz吗？
我通过系统配置， InitPll(DSP28_PLLCR,DSP28_DIVSEL);，比如外部晶振是20Mhz配置DSP28_PLLCR=6，DSP28_DIVSEL=2，这样主频是20Mhz*6/2=60Mhz
