STM8AL3136 datasheet(14/124 Pages) STMICROELECTRONICS

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Functional overview

STM8AL313x/4x/6x STM8AL3L4x/6x

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DocID18474 Rev 7

1. Legend:

ADC: Analog-to-digital converter

BOR: Brownout reset

DMA: Direct memory access

DAC: Digital-to-analog converter

I²C: Inter-integrated circuit multimaster interface

IWDG: Independent watchdog

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 medium-density STM8AL313x/4x/6x and STM8AL3L4x/6x 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, event or a Reset can be used to exit the microcontroller from Wait

mode (WFE or WFI mode). Wait consumption: refer to Table 22.

•

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 and data EEPROM

are stopped and the voltage regulator is configured in ultra-low-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 run mode consumption: refer to Table 23.

•

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. Low power wait mode consumption: refer to Table 24.

•

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

can be triggered by RTC interrupts, external interrupts or reset. Active-halt

consumption: refer to Table 25 and Table 26.

•

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. Halt consumption: refer to

Table 27.

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