MCU programming, also known as MCU flashing, is the process of writing firmware into a microcontroller’s internal flash memory. It enables the chip to perform tasks like sensor control, communication, or data processing.

This step is critical for functionality, yet often overlooked in early-stage product planning.

Two Programming Methods: In-System vs. Offline

1. In-System Programming (ISP):
   The MCU is already soldered onto the PCB and programmed via SWD, JTAG, or UART.

2. Offline Programming:
   The MCU is programmed before SMT, often via socket adapters or dedicated programming machines. This method is ideal for high-volume production and supply chain integration.

Common MCU Interfaces Supported

• STM32 / GD32 / NXP: SWD

• ESP32 / ESP8266: UART

• Holtek / Nuvoton / 8051 series: UART, SPI, or parallel

• Custom MCUs: Require matching algorithm and tooling

AXTEK: Your Trusted MCU Programming & Flashing Partner

At AXTEK, we offer end-to-end MCU flashing services to help customers simplify their production process and improve time-to-market.

Our capabilities include:

✔ STM32 / GD32 / ESP32 / Holtek / Nuvoton / 8051 programming
✔ Support for both in-system and offline programming
✔ Secure encryption, fuse bit setting, and checksum validation
✔ Mass production programming & barcode/serial number binding
✔ On-demand flashing + IC supply in one service

We work closely with EMS, OEM, and hardware startups to provide cost-effective pre-programmed microcontrollers, ready for assembly and testing.

Ideal for:

• IoT devices

• Smart home appliances

• Consumer electronics

• Industrial controllers

• Battery-powered products

  
  

Need pre-programmed MCUs or professional flashing support?
Contact AXTEK Electronic Co., Limited today. We help you handle programming, logistics, and integration — all in one go.