Raspberry Pi Pinout

GPIO 19 (PCM Frame Sync)

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PCM FSSMI SD11DPI D15I2CSL SCL / SCLKSPI1 MISOPWM1
  • Physical/Board pin 35
  • GPIO/BCM pin 19
  • Wiring Pi pin 24

GPIO 19 is used by PCM to provide a frame-sync signal to an external audio device such as a DAC chip.