---
title: "Connecting the W55RP20 Using SEGGER [J-Link]"
url: "https://maker.wiznet.io/louis_m/projects/connecting-the-w55rp20-using-segger-j-link/"
markdown_url: "https://maker.wiznet.io/louis_m/projects/connecting-the-w55rp20-using-segger-j-link/md"
type: "WCC: WIZnet Created Content"
author: "Louis"
original_author: "Louis"
license: "Apache License 2.0 (Apache-2.0)"
published: "2024-12-06"
language: "en"
hardware: ["WIZnet W55RP20"]
likes: 0
views: 1208
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Connecting the W55RP20 Using SEGGER [J-Link]

> SEGGER [J-Link] supports the W55RP20.

Original author: Louis

## Components

- **WIZnet W55RP20** x 1 ([docs](https://wiznet.io/products/ionic-chips/w55rp20))

## Article

We'll walk you through the process of setting up a microcontroller unit (MCU) using J-Link in detail. Follow these steps to ensure a smooth setup.

![](https://maker.wiznet.io/upload/ckeditor5/228353259%5F1733496472%2Ejpeg)

**1. Check what you need**

- J-Link Debugger: J-Link debugging tool provided by SEGGER.

- MCU Development Board: Development board with target MCU.

- USB cable: Cable to connect the J-Link to the PC.

- J-Link Software Package: Available for download from SEGGER's official website.

- Communication interface cable: Cable for connecting the MCU and J-Link, such as SWD, JTAG, etc. (depending on the development board).

**2. Install J-Link Software and Drivers**

- Visit the SEGGER official website: Access the SEGGER J-Link download page.

- [SEGGER - The Embedded Experts - Downloads - J-Link / J-Trace](https://www.segger.com/downloads/jlink/)

- Download the software: Download the J-Link software package for your operating system.

- Run the installation file: Run the downloaded installation file and follow the on-screen instructions to complete the installation.

- Confirm Driver Installation: The installation process will automatically install the drivers, and it is recommended that you reboot your PC after the installation is complete.

**3. Connect the J-Link and MCU**

- J-Link Connection: Connect the J-Link device to the PC using a USB cable.

- MCU Connection: Connect the J-Link to the MCU using the debugging port (SWD, JTAG, etc.) on the development board.

- Make sure the power supply and GND connections are correct when connecting.

- Verify the connection: Verify that the J-Link software recognizes the J-Link device. You can run J-Flash to check the connection status.

**4. J-Link Software Setup**

- First, create a project.

![](https://maker.wiznet.io/upload/ckeditor5/228353259%5F1733495380%2Epng)

- After running the program, J-Link needs to specify the model of the target MCU, we specify W55RP20.

![](https://maker.wiznet.io/upload/ckeditor5/228353259%5F1733495395%2Epng)

- Interface settings:
  Set the communication interface (SWD) with the MCU.
  Set Speed: Set the debugging speed. Typically, you use the default speed (for example, 4000 kHz), but you can adjust it as needed.

![](https://maker.wiznet.io/upload/ckeditor5/228353259%5F1733495464%2Epng)

**5. Test the connection**

- Verify device connectivity: Enter the connect command to verify that the J-Link connects to the MCU normally. If successful, the information of the MCU will be output.

![](https://maker.wiznet.io/upload/ckeditor5/228353259%5F1733495585%2Epng)

- Memory Read/Write Test: A simple memory read/write command can be used to further verify the connection status.You can read the address 0x10000000 to get the value.

**References**

- SEGGER J-Link Official Manual: Refer to the official manual available on the SEGGER website for more detailed information.

- Development board manuals: Refer to the manual for the MCU development board you are using to understand pin connections and settings.

- Online communities and forums: You can get additional help from communities that share experiences from developers using the same MCU and J-Link.

- Follow these steps to successfully register your J-Link and MCU and set up your debugging environment

---

Source: https://maker.wiznet.io/louis_m/projects/connecting-the-w55rp20-using-segger-j-link/