Developer Store Microcontroller Tools

Keil MDK Holtek Edition

Keil MDK is the ideal development tool suite to help engineers get high-quality Arm microcontroller-based products to market fast. The Holtek version of MDK is a professional tool suite for software developers working with Holtek devices based on the Arm Cortex-M0+, M3 and M4 processors.


µVision® IDE with Pack Installer
CMSIS RTX5 RTOS with source code
Debugger 32 KB
C/C++ Arm Compiler 32 KB
Arm processor support      
Updates and technical support   12 months 12 months
Which edition?


The Holtek version of MDK is available for software developers working with Holtek devices based on the Arm Cortex-M0+, M3 and M4 processors. The professional tool suite includes the Arm C/C++ Compiler, the Keil RTX5 real-time operating system kernel, and the µVision IDE and debugger.


This is the entry-level edition of MDK, which includes essential toolchain for projects of any size on Cortex-M0 to Cortex-M7, plus non-secure projects on Cortex-M23 and Cortex-M33. It does not include middleware.


Free to use edition for individuals or organizations creating very small and simple projects of up to 32KB in size. It also enables evaluation of the complete MDK Professional feature set for up to 7 days. Download and evaluate here.

Features & Specifications

µVision IDE
MDK's intuitive IDE has been specifically optimized for embedded developers over many years. In addition to bringing together essential development tools and system views, it features the Pack Installer, an intelligent component manager that takes care of downloading, installing and keeping track of inter-dependencies for each pack component used in the code.


C/C++ compilation toolchain
The Arm Compiler and C/C++ libraries have been tuned for real-world embedded applications. With comprehensive support for modern language standards such as C11, C++11, and C++14, the toolchain generates highly efficient code for microcontrollers


µVision debugger
In addition to responsive run-control debug, MDK enables the use of non-intrusive ETM or ITM CoreSight trace data to facilitate debug and system optimization when paired with a compatible debug probe from the ULINK family. Holtek’s e-Link32 are fully supported as well.


System Analyzer
By combining software data with CPU performance counters and actual power measurement (requires ULINKplus), MDK’s System Analyzer allows quick identification of issues related to timing, performance and/or power consumption.


Host operating system
MDK is compatible with Microsoft Windows® 10, 8 and 7 operating systems.