When it comes time to put an EFM32 microcontroller onto your custom PCB design, you'll need a way to flash firmware onto and debug the chip.
Connect the signals as shown below. The 20 Pin Header is the shrouded connector available on all EFM32 Starter Kits. Note that the header does not supply power to the target. VMCU is only for level shifting purposes.
As an example, here is a Zero Gecko Starter kit debugging an EFM32 Wonder Gecko.
The Wonder Gecko is powered by the CR2032 battery.
The signals coming from the Starter Kit debugger port.
The Wonder Gecko’s signals.
After the hardware connections are made, open the EnergyAware Commander in Simplicity Studio, and connect to the Zero Gecko Starter Kit.
Change the debug mode from MCU to OUT, and the MCU Information area will update with the Wonder Gecko data.
At this point, the Debug Out light on the Starter kit will be on.
Whenever downloading a program using the Zero Gecko Starter Kit, the firmware will be flashed to the target EFM32, and not the Zero Gecko. To switch back to the Starter Kit, simply switch the Debug mode back to MCU.
AN0002 – Hardware Design Considerations
AN0043 – Debug and Trace