Silicon Laboratories EFM8BB3-SLSTK2022A User Manual page 12

Note: This table only sums up some of the alternate functions available on the expansion header. Consult the EFM8BB31F64G data
sheet for a complete list of alternate functions.
6.3 Debug Connector
This connector is used for Debug In and Debug Out (see chapter on Debugging).
Pin num- Function
ber
1 VTARGET
2 TMS/SWDIO/C2D
4 TCK/SWCLK/C2CK
6 TDO/SWO
8 TDI
9 ATTACH
10 #RESET
12 TRACECLK
14, 16, TRACED0-3
18, 20
11, 13 NC
3, 5, 15, GND
17, 19
silabs.com | Building a more connected world.
Figure 6.3. Debug Connector
Table 6.2. Debug Connector Pinout
Note
Target voltage on the debugged application.
Note: This connection is required and is needed for the debug circuitry to match voltage levels
with the target device.
JTAG TMS, Serial Wire data I/O, or EFM8 C2 data I/O
JTAG TCK, Serial Wire clock, or EFM8 C2 clock
JTAG TDO or Serial Wire output
JTAG data in
This signal must be pulled to ground by the external debugger or application for cable insertion
detection.
Target MCU reset.
Trace clock
Trace data (4 lines)
Not Connected
UG125: EFM8BB3-SLSTK2022A User's Guide
Connectors
Rev. 0.7 | 12