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https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1309881/faq-dp83tc813s-q1-how-to-output-led1-signal-on-pin-14
默认情况下、DP83TC813的引脚14将输出 CLKOUT 信号。 要在引脚14上传输 LED1信号、请写入以下寄存器。
0x045F = 0x000F 0x0452 = 0x0000 0x0451 = 0x0009
