STM8 peripheral clock gating-EEWORLD

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Turning off the clocks of unused peripherals allows the STM8 to reduce power consumption. The peripheral clock gating (PCG) mode allows the user to turn on or off the connection between fMASTER and the following peripherals at any time in the running mode:

ADC

I2C

AWU (register clock, not counter clock)

SPI

TIM[4:1]

UART

CAN (register clock, not CAN clock)

After the STM8 system is reset, all peripheral clocks are in the on state. Users can turn off the corresponding peripheral clock by clearing the PCKEN bit in CLK_PCKENR1 or CLK_PCKENR2. However, before turning off the peripheral clock, users must set the corresponding bit to disable the peripheral.

To enable a peripheral, the user must first set the corresponding PCKEN bit in the CLK_PCKENR register, and then set the peripheral enable bit in the peripheral control register.

The AWU counter is driven by an internal or external clock (LSI or HSE) independent of fMASTER; therefore, the peripheral continues to run even if the clock to the register is turned off.

Keywords：STM8 Reference address：STM8 peripheral clock gating

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