8S003F3 Просмотр технического описания (PDF) - STMicroelectronics
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8S003F3 Datasheet PDF : 103 Pages
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STM8S003F3 STM8S003K3
Product overview
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 UART1 PCKEN27 Reserved PCKEN23 ADC
PCKEN16 Reserved 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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