STM32F437II datasheet(33/240 Pages) STMICROELECTRONICS

Part #	STM32F437II

Description	ARM Cortex-M4 32b MCUFPU, 225DMIPS, up to 2MB Flash/2564KB RAM, crypto, USB OTG HS/FS, Ethernet, 17 TIMs, 3 ADCs, 20 comm. interfaces, camera&LCD-TFT

PDF	240 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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33 / 240 page

DocID024244 Rev 10

33/240

STM32F437xx and STM32F439xx

Functional overview

3.21

VBAT operation

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

supercapacitor, or from VDD when no external battery and an external supercapacitor are

present.

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.

When PDR_ON pin is not connected to VDD (Internal Reset OFF), the VBAT functionality is

no more available and VBAT pin should be connected to VDD.

3.22

Timers and watchdogs

The 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 6 compares the features of the advanced-control, general-purpose and basic timers.

STM32F437II Datasheet(PDF) 33 Page - STMicroelectronics