STM32F732IE datasheet(39/226 Pages) STMICROELECTRONICS

39 / 226 page

DS11854 Rev 6

39/226

STM32F732xx STM32F733xx

Functional overview

•

internal clock source: LSE, LSI, HSI, or APB clock

•

external clock source over LPTIM input (working even with no internal clock source

running, used by the pulse-counter application)

•

programmable digital glitch filter

•

encoder mode

3.20.5

Independent watchdog

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

clocked from an independent 32 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.

3.20.6

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.

3.20.7

SysTick timer

This timer is dedicated to real-time operating systems, but could also be used as a standard

downcounter. It features:

•

a 24-bit downcounter

•

auto-reload capability

•

maskable system interrupt generation when the counter reaches 0

•

programmable clock source

3.21

Inter-integrated circuit interface (I2C)

The devices embed three I2Cs. Refer to Table 7: I2C implementation for the features

implementation.

The I2C bus interface handles communications between the microcontroller and the serial

I2C bus. It controls all I2C bus-specific sequencing, protocol, arbitration and timing.

The I2C peripheral supports:

•

I2C-bus specification and user manual rev. 5 compatibility:

–

Slave and master modes, multimaster capability

–

Standard-mode (Sm), with a bitrate up to 100 kbit/s

–

Fast-mode (Fm), with a bitrate up to 400 kbit/s

–

Fast-mode Plus (Fm+), with a bitrate up to 1 Mbit/s and 20 mA output drive I/Os

–

7-bit and 10-bit addressing mode, multiple 7-bit slave addresses

–

Programmable setup and hold times

–

Optional clock stretching

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