Silicon Laboratories EFM8BB2-SLSTK2021A User Manual page 13

6.4 Direct Debug Connector
This connector (J103) is used for directly debugging the EFM8 using an external debug adapter (see chapter on Debugging). This is
especially useful for debugging the MCU on the STK board when the part is battery powered or powered by an external supply.
Pin number Function
1 C2CK
2 C2D
3 GND
6.5 Reference Board
The top-right corner of the board includes a 20-pin reference board connector. The connecter contains some I/O pins that can be used
with some of the EFM8 Busy Bee's features. Additionally, the 3V3 and 5V power rails are also exported.
The figure below shows the pin assignment of the reference board header.
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1
C2CK
C2D
3
Figure 6.4. Direct Debug Connector
Table 6.3. Direct Debug Connector Pinout
Figure 6.5. Reference Board Header
UG237: EFM8BB2-SLSTK2021A User's Guide
Note
EFM8 C2 clock
EFM8 C2 data I/O
Connectors
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