回6楼: #define Fosc (11059200 ) //#define Fosc 11059200 //Crystal frequence,10MHz~25MHz,should be the same as actual status. //应当与实际一至晶振频率,10MHz~25MHz,应当与实际一至 #define Fcclk (Fosc * 5) //System frequence,should be (1~32)multiples of Fosc,and should be equal or less than 60MHz. //系统频率,必须为Fosc的整数倍(1~32),且<=60MHZ #define Fcco (Fcclk * 8) //CCO frequence,should be 2、4、8、16 multiples of Fcclk, ranged from 156MHz to 320MHz. //CCO频率,必须为Fcclk的2、4、8、16倍,范围为156MHz~320MHz #define Fpclk (Fcclk / 4) * 4 //VPB clock frequence , must be 1、2、4 multiples of (Fcclk / 4). //VPB时钟频率,只能为(Fcclk / 4)的1、2、4倍