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Timer 时钟源切换

Part Number: 66AK2H12

您好

   

   关于66AK2H12芯片Timer模块 ,外部时钟切换的问题,不理解英文描述的具体意思。如下图所示,请问如果定时器计数到10000后,需要切换为外部时钟并继续计数,需要怎么写驱动程序呢。我尝试了很多次,都不能成功。切换成外部时钟后就不能继续计数了。