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5509A CLKOUT无法分频



5509A 在线仿真时能通过SYSR对CLKOUT输出时钟分频,但烧写到flash后,通过flash引导,虽然程序能运行,但CLKOUT引脚始终是CPU时钟,SYSR分频值无效,好像DSP屏蔽了SYSR寄存器,请问是怎么回事