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GPMC通信频率问题

Other Parts Discussed in Thread: AM3354

         我采用的是GPMC异步通信,但外设频率较低,我怎么改变GPMC频率(减小输出频率),查了下datasheet,改变GPMC_FCLK即可,但GPMC_FCLK是由L3S_CLK给出的,L3S_CLK是由CORE_CLKOUTM4给出的 但是就是找不到哪个寄存器能减小CORE_CLKOUTM4时钟频率。还是改变不了呀?哪位大侠能解决小弟问题,小弟在此感谢!!!!!