AN3371 datasheet(42/45 Pages) STMICROELECTRONICS

42 / 45 page

Application examples

AN3371

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Doc ID 018624 Rev 5

Tamper

detection

This example shows how to write/read data to/from RTC backup data

registers and demonstrates the Tamper detection feature. It configures

the RTC_AF1 pin Tamper to be falling edge, and enables the Tamper

interrupt. On applying a low level on the RTC_AF1 pin, the RTC backup

data registers are reset and the Tamper interrupt is generated.

– Tamper (interrupt)

– RTC backup registers

Time Stamp

This example describes how to use the RTC peripheral and the Time

Stamp feature. It configures the RTC_AF1 pin TimeStamp to be falling

edge and enables the TimeStamp detection. On applying a low level on

the RTC_AF1 pin, the calendar is saved in the time-stamp registers

thanks to the timestamp event detection.

– Time-stamp (interrupt)

– Prescalers

– Wakeup (interrupt)

– Hardware calendar

– RTC backup registers

StopWatch

This example illustrates how to use the STM32F4xx new RTC

sub-seconds and Tamper (filter, sampling) features. It simulates

a precise chronometer with 10 record time possibilities stored in

the Backup registers (10 registers for time (second, minutes and

hours) and 10 registers for sub-seconds).

– Time-stamp

(interrupt)

– Tamper (interrupt)

– Hardware calendar

–RTC backup

registers

RTC Timer

This example provides a short description of how to use the

RTC peripherals with Alarm sub-seconds feature to simulate a

timer with a refresh time equal to 250 ms ((1 second/ 8) * 2).

The RTC is configured to generate a sub-second interrupt every

125 ms (8 interrupts per second).

– Hardware calendar

– Alarm sub-second

For Ultra Low Power Medium-density example, Alarm feature is not used.

This example is delivered only with F2/4 - series FW examples.

Table 17.

Example descriptions (continued)

Example

Description

Covered features

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