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pinout.vvzero.com/src/tr/translate/iface-gpclk.md

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#GPCLK - General Purpose CLock

General Purpose Clock pins can be set up to output a fixed frequency without any ongoing software control.

The following clock sources are available:

0     0 Hz     Ground
1     19.2 MHz oscillator
2     0 Hz     testdebug0
3     0 Hz     testdebug1
4     0 Hz     PLLA
5     1000 MHz PLLC (changes with overclock settings)
6     500 MHz  PLLD
7     216 MHz  HDMI auxiliary
8-15  0 Hz     Ground