STM8L151C8 datasheet(14/134 Pages) STMICROELECTRONICS

14 / 134 page

Functional overview

STM8L15xx8, STM8L15xR6

14/134

DocID17943 Rev 6

LCD: Liquid crystal display

POR/PDR: Power on reset / power-down reset

RTC: Real-time clock

SPI: Serial peripheral interface

SWIM: Single wire interface module

USART: Universal synchronous asynchronous receiver transmitter

WWDG: Window watchdog

3.1

Low power modes

The high density and medium+ density STM8L15xx devices support five low power modes

to achieve the best compromise between low power consumption, short startup time and

available wakeup sources:

•

Wait mode: CPU clock is stopped, but selected peripherals keep running. An internal

or external interrupt or a Reset can be used to exit the microcontroller from Wait mode

(WFE or WFI mode).

•

Low power run mode: The CPU and the selected peripherals are running. Execution

is done from RAM with a low speed oscillator (LSI or LSE). Flash memory and data

EEPROM are stopped and the voltage regulator is configured in Ultralow power mode.

The microcontroller enters Low power run mode by software and can exit from this

mode by software or by a reset.

All interrupts must be masked. They cannot be used to exit the microcontroller from this

mode.

•

Low power wait mode: This mode is entered when executing a Wait for event in Low

power run mode. It is similar to Low power run mode except that the CPU clock is

stopped. The wakeup from this mode is triggered by a Reset or by an internal or

external event (peripheral event generated by the timers, serial interfaces, DMA

controller (DMA1), comparators and I/O ports). When the wakeup is triggered by an

event, the system goes back to Low power run mode.

All interrupts must be masked. They cannot be used to exit the microcontroller from this

mode.

•

Active-halt mode: CPU and peripheral clocks are stopped, except RTC. The wakeup

can be triggered by RTC interrupts, external interrupts or reset.

•

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

The RAM content is preserved. The wakeup is triggered by an external interrupt or

reset. A few peripherals have also a wakeup from Halt capability. Switching off the

internal reference voltage reduces power consumption. Through software configuration

it is also possible to wake up the device without waiting for the internal reference

voltage wakeup time to have a fast wakeup time of 5 µs.

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