AN3133 datasheet(33/43 Pages) STMICROELECTRONICS

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AN3133

Application examples

Doc ID 16956 Rev 5

33/43

Figure 18.

LCD display description

User can manipulate the application using the Tamper, Key and Joystick navigation buttons,

the buttons actions are described in the following table.

To observe the exact time spent between the Tamper 1 button press and the Tamper 1

Interrupt, the user must simultaneously press the Key button and Tamper button until LED3

switches on; meaning that Tamper1 Interrupt occurred. Then the User can check the delay

value between the Tamper 1 button press and the Tamper 1 Interrupt.

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

STM8AL3Lx standard peripheral library available from

STM8l15x_StdPeriph_Lib.zip\Project\STM8L15x_StdPeriph_Examples\RTC\RTC_Tamper1

Detection\

The flowcharts below explain the example procedures.

Table 18.

Buttons and corresponding actions

Button

Action

Joystick UP

To increase the delay between the Tamper 1 button press and the Tamper 1

Interrupt.

Four Pre-configurations can be selected: 0s / 1s / 3s / 7s.

Note: 0s means that a tamper interrupt occurs between 0s:000 and 0s:999.

Joystick DOWN

Same as the Joystick UP, but to decrease instead on increasing the delay

between the Tamper 1 button press and the Tamper 1 Interrupt.

KEY

Store the current Time and display it on “saved time” LCD side

TAMPER

If it is kept pressed during the delay (selected using Joystick UP or DOWN

buttons), the Tamper Interrupt occurs, LED3 is On, the MCU enters in the halt

mode and LCD display is frozen. When the CPU exits Halt mode, LED3 is off.

Note: To exit from Halt mode, press the Key button (Joystick UP or DOWN can

also be used).

TMP IT after 3 s

06:336

07:963

Tamper Filter current configuration

Example: On pressing on Tamper Button,

a tamper interrupt will occur within a period

between 3s:000 and 3s:999

Current Time (seconds and milliseconds)

Saved Time (seconds and milliseconds)

The time is saved when the Key button is pressed.

Example: The key button was pressed at 06:336.

ExTamper_01

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