STM8S10XS4T6 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM8S10XS4T6

Access line, 16 MHz STM8S 8-bit MCU, up to 32 Kbyte Flash, integrated EEPROM, 10-bit ADC, timers, UART, SPI, I²C

STMicroelectronics 

Product overview

STM8S105x4/6

4.5

Clock controller

The clock controller distributes the system clock (fMASTER) coming from different

oscillators to the core and the peripherals. It also manages clock gating for low power

modes and ensures clock robustness.

Features

 Clock prescaler: to get the best compromise between speed and current consumption

the clock frequency to the CPU and peripherals can be adjusted by a programmable

prescaler.

 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.

 Master clock sources: four different clock sources can be used to drive the master

clock:

– 1-16 MHz high-speed external crystal (HSE)

– 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

Bit

Peripheral

clock

Bit

Peripheral

clock

Bit

Peripheral

clock

Bit

Peripheral

clock

PCKEN17 TIM1

PCKEN13 UART2

PCKEN27 Reserved PCKEN23 ADC

PCKEN16 TIM3

PCKEN12 Reserved PCKEN26 Reserved PCKEN22 AWU

PCKEN15 TIM2

PCKEN11 SPI

PCKEN25 Reserved PCKEN21 Reserved

PCKEN14 TIM4

PCKEN10 I2C

PCKEN24 Reserved PCKEN20 Reserved

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DocID14771 Rev 15

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