STM8S103F3P3TR datasheet(14/113 Pages) STMICROELECTRONICS

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- Up to 16 MHz high-speed user-external clock (HSE user-ext)

- 16 MHz high-speed internal RC oscillator (HSI)

- 128 kHz low-speed internal RC (LSI)

• Startup clock: After reset, the microcontroller restarts by default with an internal 2 MHz

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

program as soon as the code execution starts.

• Clock security system (CSS): This feature can be enabled by software. If an HSE clock

failure occurs, the internal RC (16 MHz/8) is automatically selected by the CSS and an

interrupt can optionally be generated.

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

application.

Table 2: Peripheral clock gating bit assignments in CLK_PCKENR1/2 registers

Peripheral

clock

Bit

Peripheral

clock

Bit

Peripheral

clock

Bit

Peripheral

clock

Bit

ADC

PCKEN23

Reserved

PCKEN27

UART1

PCKEN13

TIM1

PCKEN17

AWU

PCKEN22

Reserved

PCKEN26

Reserved

PCKEN12

Reserved

PCKEN16

Reserved

PCKEN21

Reserved

PCKEN25

SPI

PCKEN11

TIM2

PCKEN15

Reserved

PCKEN20

Reserved

PCKEN24

PCKEN10

TIM4

PCKEN14

Power management

4.6

For efficent power management, the application can be put in one of four different low-power

modes. You can configure each mode to obtain the best compromise between lowest power

consumption, fastest start-up time and available wakeup sources.

• Wait mode: In this mode, the CPU is stopped, but peripherals are kept running. The

wakeup is performed by an internal or external interrupt or reset.

• Active halt mode with regulator on: In this mode, the CPU and peripheral clocks are

stopped. An internal wakeup is generated at programmable intervals by the auto wake up

unit (AWU). The main voltage regulator is kept powered on, so current consumption is

higher than in active halt mode with regulator off, but the wakeup time is faster. Wakeup

is triggered by the internal AWU interrupt, external interrupt or reset.

• Active halt mode with regulator off: This mode is the same as active halt with regulator

on, except that the main voltage regulator is powered off, so the wake up time is slower.

• Halt mode: In this mode the microcontroller uses the least power. The CPU and peripheral

clocks are stopped, the main voltage regulator is powered off. Wakeup is triggered by

external event or reset.

Watchdog timers

4.7

The watchdog system is based on two independent timers providing maximum security to

the applications.

DocID15441 Rev 6

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