STM32F207IE datasheet(26/177 Pages) STMICROELECTRONICS

26 / 177 page

Description

STM32F20xxx

26/177

Doc ID 15818 Rev 9

2.2.19

VBAT operation

The VBAT pin allows to power the device VBAT domain from an external battery or an

external supercapacitor.

VBAT operation is activated when VDD is not present.

The VBAT pin supplies the RTC, the backup registers and the backup SRAM.

Note:

When the microcontroller is supplied from VBAT, external interrupts and RTC alarm/events

do not exit it from VBAT operation.

2.2.20

Timers and watchdogs

The STM32F20x devices include two advanced-control timers, eight general-purpose

timers, two basic timers and two watchdog timers.

All timer counters can be frozen in debug mode.

Table 4 compares the features of the advanced-control, general-purpose and basic timers.

Table 4.

Timer feature comparison

Timer type Timer

Counter

resolution

Counter

type

Prescaler

factor

DMA

request

generation

Capture/

compare

channels

Complementary

output

Max

interface

clock

Max

timer

clock

Advanced-

control

TIM1,

TIM8

16-bit

Up,

Down,

Up/down

Any integer

between 1

and 65536

Yes

60 MHz

120

MHz

General

purpose

TIM2,

TIM5

32-bit

Up,

Down,

Up/down

Any integer

between 1

and 65536

Yes

30 MHz

MHz

TIM3,

TIM4

16-bit

Up,

Down,

Up/down

Any integer

between 1

and 65536

Yes

30 MHz

MHz

Basic

TIM6,

TIM7

16-bit

Any integer

between 1

and 65536

Yes

30 MHz

MHz

General

purpose

TIM9

16-bit

Any integer

between 1

and 65536

60 MHz

120

MHz

TIM10,

TIM11

16-bit

Any integer

between 1

and 65536

60 MHz

120

MHz

TIM12

16-bit

Any integer

between 1

and 65536

30 MHz

MHz

TIM13,

TIM14

16-bit

Any integer

between 1

and 65536

30 MHz

MHz

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