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AM335x晶振频率问题



请教一下各位我现在需要MCASP做主模式输出6.144MHZ的时钟。所以晶振如果选择24.576M的晶振在设置DPLL MPU这些时钟时会出现时钟不准确。请问这样有没影响?通常codec的MCLK是要外接有源晶振吗?