ST Manuals

This application note is intended for STM8 firmware and system designers who need to implement an in-application programming (IAP) feature in the product they are developing with the STM8 microcontroller. The STM8 is an 8-bit microcontroller family with a Flash memory for storing the user program code or firmware. IAP makes it possible to update the firmware ‘in situ’, after the microcontroller has been embedded in the final product. The advantage is that the microcontroller board can stay inside its product enclosure. No mechanical intervention is needed to make the update. IAP is extremely useful for distributing new firmware versions. It makes it easy to add new product features and correct problems throughout the product life cycle. The user-bootloader firmware source code provided with this application note shows an example of how to implement IAP for the STM8 microcontroller. Use this code as a reference when integrating IAP in your STM8 application. It includes the following features: ● Bootloader activated by external pin (jumper on PCB) ● Flash block programing by executable RAM code management ● Read while write (RWW) feature ● High level C-language usage ● Reduced size of the code (optimized code) ● Support for multiple communication interfaces (SPI , I2C, and UART) ● UART code compatible with ST Flash loader demonstrator

The STMicroelectronics Medium- and High-density STM32F101xx and STM32F103xx Cortex™-M3 based microcontrollers come with 12-bit enhanced ADC sampling with a rate up to Msamples/s. In most applications, this resolution is sufficient, but in some cases where higher accuracy is required, the concept of oversampling and decimating the input signal can be implemented to save the use of an external ADC solution and to reduce the application consumption. This application note gives two methods to improve ADC resolution. These techniques are based on the same principle: oversampling the input signal with the maximum 1 MHz ADC capability and decimating the input signal to enhance its resolution. The method and the firmware given within this application note apply to both Medium- and High-density STM32F10xxx products. Some specific hints are given at the end of the application note to take advantage of the Medium- and High-density STM32F103xx performance line devices and of the High-density STM32F101xx access line devices. This application note is split into two main parts: the first one describes how oversampling increases the ADC-specified resolution while the second describes the guidelines to implement the different methods available and gives the firmware flowchart of their implementation on the STM32F101xx and STM32F103xx devices.

This document presents the process of porting an application from ST10F269Zx to ST10F273Z4, including modified and new functionalities.

This application note shows how to use a simple technique to increase the number of inputs and/or outputs.

This document explains how to achieve 32-bit timer resolution using the link system in STM32F10x microcontrollers. It provides the principles and timer configurations for achieving 32-bit input capture timer resolution.

This application note explains the mechanism of the interrupt management hardware in the STR91x microcontroller family, and also provides application developers with software recommendations for interrupt handling.

This application note describes an EEPROM emulation technique using the on-chip Flash memory in the STM32F10x devices. It also discusses the differences between external EEPROM and embedded Flash memory.

This document provides advice and guidance on designing applications based on devices of the ST10F27xZx family, including the ST10F276Z5, ST10F273Z4, ST10F272Z2, and ST10F271Z1. It covers topics such as using an external resonator, startup configuration, filtering, decoupling, reducing ADC conversion errors, memory interface, and interfacing with the L4969 CAN interface.

This application note discusses the RTC calibration basics and explains how RTC calibration can be used to improve timekeeping accuracy

This document introduces the STM32 microcontroller system memory boot mode. It describes that the main task of the bootloader stored in the internal boot ROM memory is to download the application program to the internal Flash memory through one of the available serial peripherals (USART, CAN, USB, etc.). A communication protocol is defined for each serial interface, with a compatible command set and sequences.

This application note provides technical details on the software and tools associated with implementing a serial numbering technique. It also provides examples and hints for serial number encoding techniques that can be applied to any ST7 microcontrollers equipped with non-volatile memory.

This application note describes a technique for implementing an ADC for measuring both positive and negative input voltages while operating from a single (positive) supply.

This application note describes the CAN interrupt drivers of the ST10F27x and provides programming examples that can be used to define interrupt schemes and write interrupt drivers.

This application note is intended for system designers who require a software and hardware implementation overview of the low-power modes of the STM32F101xx, STM32F102xx and STM32F103xx products. It describes how to use the STM32F10xxx product family and details the clock systems, register settings and low-power management in order to optimize the use of STM32F10xxx in applications where low power is key.

This application note provides the user with a low cost oscillator solution with discrete components and based on a resonator or quartz that can be used for STR71x MCU.