Skip to main content
  • Products
  • Software evaluation
  • Downloads
  • Free utilities
  • Purchase
  • Silicon Vendors
  • Support
  • About us
  • Blog
  • Forum
  • Search
  • Jobs
  • Newsletter
  • Blog
  • Contact
  • Shop
  • Program embedded systems
  • 9-Pin Cortex-M Adapter

    9-Pin Cortex-M Adapter

    Seamless connectivity for Flasher

    • JTAG, SWD & SWO support
    • 9-pin Cortex-M interface
    Buy now Compare Flasher adapters Documentation

    Overview

    The 9-Pin Cortex-M Adapter connects  J-Link or Flasher to Cortex-M based target hardware for JTAG, SWD, and SWO communication. It adapts the 20-pin 0.1" JTAG connector to the 9-pin 0.05" Samtec FTSH connector defined by Arm. The adapter can also be used with non-Cortex-M targets that use the same pinout. A solder bridge allows TRST to be connected when required.

    J-Link 19 pin Cortex M

    Technical specifications

    Supported connections
    JTAG, SWD, and SWO
    Target hardware
    Cortex-M based target hardware systems
    Non-Cortex-M targets
    Can also be used with non-Cortex-M targets if the target connector uses the same pinout
    Input connector
    20-pin 0.1" JTAG connector
    Connector standard
    9-pin connector as defined by Arm
    TRST
    Not connected by default
    TRST connection option
    Solder bridge (NR1) allows TRST to be connected to pin 9 of the Cortex-M Adapter

    Pinout & schematics

    Schematic diagram showing connections for a 19-pin and a 9-pin programmer probe. Various pins are labeled, including VTREF, TDI, TMS, TCK, TDO, nSRST, and VSUPPLY, with a "DNP" note on one pin and "GND" marked at the bottom.

    Suitable products

    Flasher

    A handheld device labeled "Flasher" from SEGGER, primarily gray with blue rubber edges. It features three status indicators: "Ready" (OK), "Not ready," and "Fail," along with a "PROG" button. This device is used for programming and debugging electronics.
    • Flasher Pro
    • Flasher Pro XL
    • Flasher Compact
    • Flasher Portable PLUS

    J-Link

    Image of a J-Link debugging device from SEGGER. The device has a rectangular shape with a black casing and a silver panel featuring the "J-Link" logo and SEGGER branding. It includes several buttons and indicators for user interaction.
    • J-Link Pro PoE
    • J-Link Pro
    • J-Link WiFi
    • J-Link PLUS Compact
    • J-Link BASE Compact

    Get in touch with us

    Have questions or need assistance? Our Embedded Experts are here to help!

    Reach out to us for:

    • Licensing quotes
    • Technical inquiries
    • Project support

     

    Contact us

    • Online documentation
    • List of downloads
    • Pricing
    • Buy now
    • Regulatory documents

    Headquarters

    SEGGER Microcontroller GmbH

    Ecolab-Allee 5
    40789 Monheim am Rhein, Germany
    info@segger.com
    Tel.: +49-2173-99312-0
    Fax: +49-2173-99312-28

    Locations

    USA: SEGGER Microcontroller Systems LLC

    Boston area
    101 Suffolk Lane
    Gardner, MA 01440, USA
    us-east@segger.com
    Tel.: +1-978-874-0299
    Fax: +1-978-874-0599

    Silicon Valley
    Milpitas, CA 95035, USA
    us-west@segger.com
    Tel.: +1-408-767-4068

    China: SEGGER Microcontroller China Co., Ltd.

    Room 218, Block A, Dahongqiaoguoji
    No. 133 Xiulian Road
    Minhang District, Shanghai 201199, China
    china@segger.com
    Tel.: +86-133-619-907-60

    ISO 9001
    ISO 27001
    First-class embedded software tools since 1992
    Designed and made in Germany
    • Imprint
    • Disclaimer
    • Code of Conduct
    • Privacy Policy
    © 2026 SEGGER - All rights reserved.