STM32F101X4 datasheet(17/73 Pages) STMICROELECTRONICS | Low-density access line, ARM-based 32-bit MCU with 16 or 32 KB Flash, 5 timers, ADC and 4 communication interfaces

Part No.	STM32F101X4

Description	Low-density access line, ARM-based 32-bit MCU with 16 or 32 KB Flash, 5 timers, ADC and 4 communication interfaces

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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STM32F101x4, STM32F101x6

Description

Doc ID 15058 Rev 3

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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.

2.3.14

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

register to generate an alarm. A 20-bit prescaler is used for the time base clock and is by

default configured to generate a time base of 1 second from a clock at 32.768 kHz.

2.3.15

Independent watchdog

The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is

clocked from an independent 40 kHz internal RC and as it operates independently from the

main clock, it can operate in Stop and Standby modes. It can be used as a watchdog to

reset the device when a problem occurs, or as a free running timer for application timeout

management. It is hardware or software configurable through the option bytes. The counter

can be frozen in debug mode.

2.3.16

Window watchdog

The window watchdog is based on a 7-bit downcounter that can be set as free running. It

can be used as a watchdog to reset the device when a problem occurs. It is clocked from the

main clock. It has an early warning interrupt capability and the counter can be frozen in

debug mode.

2.3.17

SysTick timer

This timer is dedicated for OS, but could also be used as a standard down counter. It

features:

●

A 24-bit down counter

●

Autoreload capability

●

Maskable system interrupt generation when the counter reaches 0.

●

Programmable clock source

2.3.18

General-purpose timers (TIMx)

There areup to two synchronizable general-purpose timers embedded in the STM32F101xx

low-density access line devices. These timers are based on a 16-bit auto-reload up/down

counter, a 16-bit prescaler and feature 4 independent channels each for input capture,

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STMicroelectronics	STM32F101X4	1Mb / 77P	Low-density access line, ARM-based 32-bit MCU with 16 or 32 KB Flash, 5 timers

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STM32F101X4 Datasheet(PDF) 17 Page - STMicroelectronics

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