STMicroelectronics AN3996 Adjustable LED Blinking Speed Application Note

This application note provides a short description of the demonstration firmware Discover which is preprogrammed in the Flash memory of the STM8S003K3T6 microcontroller

Brand: STMicroelectronics
Category: microcontrollers
Document type: Application Note
Language: English
Pages: 10
File format: PDF
File size: 99 KB
Published: 06 August, 2012
Updated: 30 September, 2023
Model: STM8SVLDISCOVERY
MD5 checksum: EFC104DC371767821727FC72B49FA877
PDF: STMicroelectronics AN3996 Adjustable LED Blinking Speed Application Note PDF

About this manual

The document details a demonstration firmware preprogrammed into the Flash memory of the STM8SO003K3T6 microcontroller within the STM8SVLDISCOVERY evaluation board. This software utilizes the basic 8-bit timer TIM4 as a time-base generator to control the blinking frequency of LED LD1.

What's inside

Application description
Hardware required
Application principle
Software description
STM8S standard firmware library configuration
Main loop flowchart
Blinking_StateMachine flowchart
Revision history

Specifications

Master clock source at power-on	HSI clock with prescaler division factor equal to 8
Master clock frequency	2 MHz
TIM4 time base	4 ms
TIM4 counting frequency	62.5 KHz

Frequently asked questions

What happens when the push button B1 is pressed?

Each time the push button event is detected, the delay between LED toggles is adjusted to change the blinking frequency.

What are the LED blinking periods for each button press?

The first press sets a 200 ms period, the second press sets a 100 ms period, and the third press switches the LED off.

What is the initial blinking period at startup?

At application start-up, the blinking period is configured to 1 second.

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