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No programmer needed to program an MCU? This circuit allows for automatic one-click downloading!

Latest update time：2026-04-08
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Article Overview

This article introduces a debugger design scheme for one-click automatic downloading of MCU programs using a USB -to -TTL serial port . It focuses on elaborating on the online programming of blank circuit board components through ISP ( In-System Programming ) technology. Taking the STM32F103 microcontroller as an example, the article designs a one-click download circuit, introduces its various components and the specific implementation method, and verifies the feasibility and practicality of the circuit through experiments.

In daily development and debugging, we often use programmers like J-Link to download programs to the MCU . Today, General Circuits is sharing a debugger that can automatically download programs with one click, which is also a USB to TTL serial port automatic download circuit.