AN3133 datasheet(37/43 Pages) STMICROELECTRONICS

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AN3133

Application examples

Doc ID 16956 Rev 5

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6.5

Example 5: Chronometer

This example provides a short description of how to use the RTC peripheral's calendar (sub-

seconds, seconds, minutes, hours) and Tamper features to simulate an accurate

chronometer with 9 counter records, and Start/Pause/Resume actions.

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

STM8AL3Lx standard peripheral library available from

STM8l15x_StdPeriph_Lib\Project\STM8L15x_StdPeriph_Examples\RTC\RTC_ChronoSub

Second\

In this example an interactive human interface is developed using STM8L1528-EVAL's LCD

and joystick to allow user to use the chronometer with the real-time display.

After startup, a default 00:00:00:000 chronometer counter is displayed on the LCD, which

correspond to [Hours]:[minutes]:[seconds]:[milliseconds].

User can manipulate the chronometer features using the Tamper, Key and Joystick

navigation buttons.

The buttons actions are described in the following table.

The flowcharts below explain the example procedures.

Table 19.

Buttons and corresponding actions

Button

Action

Joystick SEL

To Start/Pause/Resume the chronometer counter

Joystick DOWN

To enter to the “Recorded Times menu”, where you can navigate using the

Joystick RIGHT/LEFT buttons.

Joystick UP

to exit from the “Recorded Times menu”

TAMPER

Keep it pressed during 2sec to enter to the “reset menu” where you can

select using RIGHT/LEFT buttons to clear the counter and/or the recorded

times.

Note: During Pause, Pressing on Tamper Button does not have any effect.

Joystick LEFT

Joystick RIGHT

Used in the “reset menu” to clear the counter and/or the recorded times.

KEY

To store the current chronometer counter and rank.

Note: 9 records can be performed.

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