Standby Mode

Follow the steps below to enter the standby mode:
  1. Configure PMU to turn off all internal digital power except CPU.
  2. The system clock source is switched to the OSC (clk_cpu_root, clk_bus_root), because the PLL power will be turned off in the next step.
  3. Configure the PMU wakeup source and the modules that need to be powered up, RTCWOL/RGPIO.
  4. Configure the PMU power-off CPU. The PMU will automatically pull down RGPIO2 and turn off all output power of the PMIC: VDD18, VDDO9VDD33, VDDQ11.
  5. Enter standby mode.