STMicroelectronics AN1575 On-Board Programming Methods Application Note

About this manual

This document presents various methods for programming ST7 Microcontrollers (MCUs) that have already been soldered onto a Printed Circuit Board (PCB). It details techniques to update firmware or data, addressing the complexity of high pin-count Surface Mounted Devices (SMD). The note covers two main contexts: programming when the application is not running and programming while the application is running.

What's inside

• Introduction
• In Circuit Programming (ICP)
• In-Application Programming (IAP)
• Application power supply
• Application clock
• IAP Overview
• IAP Practical Implementation
• Upgrade from serial EEPROM
• USB-based example
• Local Network example

Frequently asked questions

What voltage is required on the VPP pin for HDFLASH-based devices?

The connector features a line to allow supplying 12V externally on the VPP pin.

How many sectors are available in the ST7 program memory?

The program memory is divided into several sectors, with a maximum of three.

Can the hardware watchdog be ignored during Program/Erase operations?

No, the hardware watchdog remains active and must be refreshed before performing any Program/Erase operations on the FLASH.