STM32F101XC_11 datasheet(19/112 Pages) STMICROELECTRONICS

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STM32F101xC, STM32F101xD, STM32F101xE

Description

Doc ID 14610 Rev 8

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General-purpose timers (TIMx)

There are up to 4 synchronizable general-purpose timers (TIM2, TIM3, TIM4 and TIM5)

embedded in the STM32F101xC, STM32F101xD and STM32F101xE 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/output compare, PWM or one-pulse

mode output. This gives up to 16 input captures / output compares / PWMs on the largest

packages.

The general-purpose timers can work together with the advanced-control timer via the Timer

Link feature for synchronization or event chaining. Their counter can be frozen in debug

mode. Any of the general-purpose timers can be used to generate PWM outputs. They all

have independent DMA request generation.

These timers are capable of handling quadrature (incremental) encoder signals and the

digital outputs from 1 to 3 hall-effect sensors.

Basic timers TIM6 and TIM7

These timers are mainly used for DAC trigger generation. They can also be used as a

generic 16-bit time base.

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 either 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.

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.

Table 4.

Timer feature comparison

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA request

generation

Capture/compare

channels

Complementary

outputs

TIM2,

TIM3,

TIM4,

TIM5

16-bit

Up,

down,

up/down

Any integer

between 1

and 65536

Yes

TIM6,

TIM7

16-bit

Any integer

between 1

and 65536

Yes

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