STM32F102XB datasheet(15/76 Pages) STMICROELECTRONICS

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STM32F102x8, STM32F102xB

Description

Doc ID 15056 Rev 4

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Low-power modes

The STM32F102xx medium-density USB access line supports three low-power modes to

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

available wakeup sources:

●

Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs.

●

Stop mode

The Stop mode achieves the lowest power consumption while retaining the content of

SRAM and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC

and the HSE crystal oscillators are disabled. The voltage regulator can also be put

either in normal or in low power mode.

The device can be woken up from Stop mode by any of the EXTI line. The EXTI line

source can be one of the 16 external lines, the PVD output or the RTC alarm.

●

Standby mode

The Standby mode is used to achieve the lowest power consumption. The internal

voltage regulator is switched off so that the entire 1.8 V domain is powered off. The

PLL, the HSI RC and the HSE crystal oscillators are also switched off. After entering

Standby mode, SRAM and registers content are lost except for registers in the Backup

domain and Standby circuitry.

The device exits Standby mode when an external reset (NRST pin), a IWDG reset, a

rising edge on the WKUP pin, or an RTC alarm occurs.

Note:

The RTC, the IWDG, and the corresponding clock sources are not stopped by entering Stop

or Standby mode.

DMA

The flexible 7-channel general-purpose DMA is able to manage memory-to-memory,

peripheral-to-memory and memory-to-peripheral transfers. The DMA controller supports

circular buffer management avoiding the generation of interrupts when the controller

reaches the end of the buffer.

Each channel is connected to dedicated hardware DMA requests, with support for software

trigger on each channel. Configuration is made by software and transfer sizes between

source and destination are independent.

The DMA can be used with the main peripherals: SPI, I2C, USART, general purpose timers

TIMx and ADC.

RTC (real-time clock) and backup registers

The RTC and the backup registers are supplied through a switch that takes power either on

VDD supply when present or through the VBAT pin. The backup registers are ten 16-bit

registers used to store 20 bytes of user application data when VDD power is not present.

The real-time clock provides a set of continuously running counters which can be used with

suitable software to provide a clock calendar function, and provides an alarm interrupt and a

periodic interrupt. It is clocked by a 32.768 kHz external crystal, resonator or oscillator, the

internal low power RC oscillator or the high-speed external clock divided by 128. The

internal low power RC has a typical frequency of 40 kHz. The RTC can be calibrated using

an external 512 Hz output to compensate for any natural crystal deviation. The RTC

features a 32-bit programmable counter for long term measurement using the Compare

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