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C6701 Timer精度问题

请问一下TI工程师,C6701的Timer1定时精度有多高,有多大误差。目前想使用Timer定时触发FPGA,定时时间为12秒,因为Timer1的运行时钟为DSP主频的四分之一,所以给Timer1 CTL寄存器,PRD寄存器,CNT寄存器分别配置了512,30000000*12, 0;但是简单的测试了一下发现有一定的误差,大概在1s左右。