STM32L471RG datasheet(43/218 Pages) STMICROELECTRONICS

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STM32L471xx

Functional overview

3.22

Random number generator (RNG)

All devices embed an RNG that delivers 32-bit random numbers generated by an integrated

analog circuit.

3.23

Timers and watchdogs

The STM32L471 includes two advanced control timers, up to nine general-purpose timers,

two basic timers, two low-power timers, two watchdog timers and a SysTick timer. The table

below compares the features of the advanced control, general purpose and basic timers.

3.23.1

Advanced-control timer (TIM1, TIM8)

The advanced-control timer can each be seen as a three-phase PWM multiplexed on 6

channels. They have complementary PWM outputs with programmable inserted dead-

times. They can also be seen as complete general-purpose timers. The 4 independent

channels can be used for:

•

Input capture

•

Output compare

•

PWM generation (edge or center-aligned modes) with full modulation capability (0-

100%)

•

One-pulse mode output

In debug mode, the advanced-control timer counter can be frozen and the PWM outputs

disabled to turn off any power switches driven by these outputs.

Table 10. Timer feature comparison

Timer type

Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

outputs

Advanced

control

TIM1, TIM8

16-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM2, TIM5

32-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM3, TIM4

16-bit

Up, down,

Up/down

Any integer

between 1

and 65536

Yes

General-

purpose

TIM15

16-bit

Any integer

between 1

and 65536

Yes

General-

purpose

TIM16, TIM17

16-bit

Any integer

between 1

and 65536

Yes

Basic

TIM6, TIM7

16-bit

Any integer

between 1

and 65536

Yes

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