Silicon Laboratories EFM8BB2-SLSTK2021A User Manual page 17

9. Board Controller
The kit contains a board controller that is responsible for performing various board-level tasks, such as handling the debugger and the
Advanced Energy Monitor. An interface is provided between the EFM8 and the board controller in the form of a UART connection. The
connection is enabled by setting the EFM_BC_EN (P2.0) line high, and using the lines EFM_BC_TX (P0.4) and EFM_BC_RX (P0.5) for
communicating.
The BC enable signal connects the EFM8 to the board controller:
• 0: EFM8 UART pins are isolated from the Board Controller.
• 1: EFM8 UART pins are connected to the Board Controller (default upon reset).
Note: The board controller is only available when USB power is connected.
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Board Controller
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