STM32H533CE datasheet(48/231 Pages) STMICROELECTRONICS

48 / 231 page

Functional overview

STM32H533xx

48/231

DS14539 Rev 1

application timeout management. It is hardware or software configurable through the option

bytes. The counter can be frozen in Debug mode.

3.33.6

Window watchdog (WWDG)

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.

3.33.7

SysTick timer

The Cortex-M33 with TrustZone embeds two SysTick timers.

When TrustZone is activated, two SysTick timer are available:

•

SysTick, secure instance

•

SysTick, non-secure instance

When TrustZone is disabled, only one SysTick timer is available. This timer (secure or non-

secure) is dedicated to real-time operating systems, but can also be used as a standard

down counter. It features:

•

A 24-bit down counter

•

Autoreload capability

•

Maskable system interrupt generation when the counter reaches 0

•

Programmable clock source.

3.34

Real-time clock (RTC), tamper and backup registers

3.34.1

Real-time clock (RTC)

The RTC supports the following features:

•

Calendar with subsecond, seconds, minutes, hours (12 or 24 format), weekday, date,

month, year, in BCD (binary-coded decimal) format

•

Binary mode with 32-bit free-running counter

•

Automatic correction for 28, 29 (leap year), 30, and 31 days of the month

•

Two programmable alarms

•

On-the-fly correction from 1 to 32767 RTC clock pulses. This can be used to

synchronize it with a master clock

•

Reference clock detection: a more precise second source clock (50 or 60 Hz) can be

used to enhance the calendar precision

•

Digital calibration circuit with 0.95 ppm resolution, to compensate for quartz crystal

inaccuracy

•

Timestamp feature that can be used to save the calendar content. This function can be

triggered by an event on the timestamp pin, or by a tamper event, or by a switch to

VBAT mode

•

17-bit auto-reload wake-up timer (WUT) for periodic events with programmable

resolution and period

•

TrustZone support:

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