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其McBSP 最大可接收多少MHZ的频率？
请参考手册5.15 Multichannel Buffered Serial Port (McBSP) Timings
参数M1或者M11
Min=2P
P = (Divider2 Ratio)/(CPU Clock Frequency) in ns. For example, when running parts at 300 MHz with the slow peripheral domain at 1/2
the CPU clock frequency, use P = 2/300 MHz = 6.66 ns.
那是不是可以这样理解？ Divider2 Ratio 设为1 那么Min=6.66ns 也就是说频率最高在150MHZ
参考芯片手册table 3-11，sysclk2的最高频率为sysclk1, max sysclk1为150MHz，所以不用将Divider2 Ratio 设为1，这样算来，McBSP的最高时钟为75MHz.
