AN3133 datasheet(29/43 Pages) STMICROELECTRONICS

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AN3133

Application examples

Doc ID 16956 Rev 5

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Application examples

STM8L/STM8AL RTC firmware is provided with a set of examples so that the user can

quickly become familiar with the firmware library.

This section provides five examples:

●

The first one shows how to configure and display calendar and alarm settings.

●

The second example shows how to configure wakeup unit in low power mode.

●

The third example shows how to generate wakeup events at a frequency higher than

1 Hz.

●

The fourth example shows how to use the tamper detection features.

●

The fifth example shows how to use calendar and tamper detect features to implement

an accurate chronometer.

6.1

Example 1: Calendar and alarm

This example provides a short description of how to use the RTC peripheral calendar

features: seconds, minutes, hours (12 or 24 format), day, date, month, and year.

This example is delivered within the STM8L05x/STM8L15x/STM8L16x/STM8AL31x/

STM8AL3Lx standard peripheral library available from http://wwwst.com/stm8l (documents

and files for the STM8L family). It is located at STM8l15x_StdPeriph_Lib.zip\Project\

STM8L15x_StdPeriph_Examples\RTC\RTC_WakeupLPMode\

This example runs on both the STM8L1526-EVAL and STM8L1528-EVAL boards. It enables

configuring the RTC calendar and alarm and displaying their values in real-time using the

LCD and joystick.

After power-up, the default date and time are displayed on the LCD. The user can then

modify the date, time and alarm using the joystick buttons.

When an alarm occurs, a message is displayed on the LCD, and the LEDs toggle for a

second.

The flowcharts of this example are presented in Figure 14 and Figure 15.

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