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J-Mem is a GUI application that displays memory contents of microcontrollers and allows modifications of RAM as well as special function registers while the target is running.
Available for Windows, macOS and Linux, it is included in the J-Link Software and documentation package.
It is free with any model J-Link or J-Trace.

J-Mem is a small stand-alone application available for Windows, macOS and Linux. J-Mem makes it possible to look into the memory of a chip at run-time using J-Link or J-Trace:

  • RAM can be modified
  • Special Function Registers (SFRs) can be written
  • Whole regions in RAM can be filled with a desired value
  • Memory sections can be saved to a .bin file
  • A periodic refresh of the displayed memory contents can be set

The memory accesses can be selected to be 8, 16 or 32 bit.
J-Mem works nicely when modifying SFRs, especially because it writes the SFR only after the complete value has been entered.


J-Mem is distributed as part of the J-Link software and documentation package and can be used free of charge.