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关于DSP C5517 CLKOUT输出时钟无信号问题

Other Parts Discussed in Thread: TMS320C5517

使用C5517过程中,想使用CLKOUT输出时钟给codec,如以下设置

CSL_FINST (CSL_SYSCTRL_REGS->CLKOUTCR, SYS_CLKOUTCR_SRC, MODE0);

CSL_FINST (CSL_SYSCTRL_REGS->CLKOUTCR, SYS_CLKOUTCR_SRC, MODE7);

用示波器测量CLKOUT输出均为低电平,请问是否需要先配置什么?或者是配置方法不对