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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1452956/faq-dp83848q-q1-how-to-disable-25mhz-clkout-output
工具与软件：
如果 DP83848上未使用 CLKOUT 输出、则可以使用以下寄存器写入来禁用它。 这可能有利于 EMC 发射测试、从而 更大限度地减少25MHz 谐波的能量。
0x13[0]= 1 0x15[14]= 1
