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dsp c6747运行速度



6747使用的是24兆晶振,经过倍频后324兆的运行速度,我用一个10us的定期器,测试运行速度,打断点执行了一个j++指令,就显示进入了两次中断,约为20us,按照理论不是3ns怎么差了这么大?是要设置其他的吗?