What's Happening at SEGGER?

2015 |
Jun. 05
J-Link, Press Releases 2015
J-Link support added to IAR and KEIL 8051

J-Link support added to IAR and KEIL 8051 toolchains

SEGGER’s J-Link enables super-fast, direct debugging on Silicon Laboratories’ (SiLabs) EFM8 (8051-core) devices. This is now supported by both market-leading toolchains, Keil’s PK51 and IAR’s Embedded Workbench. The J-Link’s debug speed far surpasses all previously available solutions for 8051.

Connection is established via the C2 2-wire interface, a proprietary debug interface defined by SiLabs. Very high speed is true for downloading in both RAM and flash, as well as debugging.

“It shows that our J-Links are also very valuable on smaller MCUs such as EFM8,” says Alexander Gruener, Product Manager at SEGGER Microcontroller.“The debug probes deliver the same benefits to the EFM8 as they have long proven in 32-bit architectures, such as ease of use, high performance and direct download to flash memory.”

EFM8 support is included in all current J-Link models and can be used without purchasing any additional license.

More information on J-Link is available at


J-Flash SPI is part of the latest version of the J-Link software and documentation pack.

More information on J-Link SPI is available at