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This article describes device specifics of the Silicon Labs EFM32 series devices


Auto SWO speed calculation of J-Link does not work for the Silicon Labs EFM32 series devices.

  • Normal SWO Speed calculation: <CPUFreq> / n
  • EFM32 specific:Chip-internally wired to a fixed 14 MHz clock (AUXHFRCO)

For utilities like J-Link SWOViewer or similar:

  • Select 14 MHz as CPU speed (no matter what the CPU is really running at) to make the normal calculation working