STM8AP5X2ATAY datasheet(16/100 Pages) STMICROELECTRONICS

16 / 100 page

Product overview

STM8AF61xx, STM8AF51xx

16/100

5.5

Low-power operating modes

The product features various low-power modes:

●

Slow mode: Prescaled CPU clock, selected peripherals at full clock speed

●

Active halt mode: CPU and peripheral clocks are stopped

●

Halt mode: CPU and peripheral clocks are stopped, the device remains powered on.

Wake-up is triggered by an external interrupt.

In all modes the CPU and peripherals remain permanently powered on, the system clock is

applied only to selected modules.

The RAM content is preserved and the brown-out reset circuit remains activated.

5.6

Clock and clock controller

The clock controller distributes the system clock coming from different oscillators to the core

and the peripherals. It also manages clock gating for low power modes and ensures clock

robustness.

5.6.1

Features

●

Clock sources:

–

Internal 16 MHz and 128 kHz RC oscillators

–

Crystal oscillator

–

External clock input

●

Reset: After reset the microcontroller restarts by default with an internal 2-MHz clock

(16 MHz/8). The prescaler ratio and clock source can be changed by the application

program as soon as the code execution starts.

●

Safe clock switching: Clock sources can be changed safely on the fly in run mode

through a configuration register. The clock signal is not switched until the new clock

source is ready. The design guarantees glitch-free switching.

●

Clock management: To reduce power consumption, the clock controller can stop the

clock to the core, individual peripherals or memory.

●

Wake-up: Recovery from halt and AWU (auto wake-up) low power modes uses the

internal RC oscillator (16 MHz/8) for quick start-up and then switches to the last

selected clock source before halt mode is entered.

●

Clock security system (CSS): The CSS permits monitoring of external clock sources

and automatic switching to the internal RC (16 MHz/8) in case of a clock failure.

●

Configurable main clock output (CCO): This outputs an external clock for use by the

application.

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