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| 型号： | STM8AF6146TDXXXX |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | MICROCONTROLLER, PQFP32 |
| 封装： | 7 X 7 MM, LQFP-32 |
| 文件页数： | 7/90页 |
| 文件大小： | 1466K |
| 代理商： | STM8AF6146TDXXXX |
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STM8AF61xx STM8AH61xx
Product overview
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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