MCU Port Pin
Port Pin Assigned
Function
Primary Board Connec-
tion
Secondary Board Con-
nection
Expansion Port Con-
nection (EXP)
P1.7
ADC / CMP
Joystick
P2.0
UART1 TX
UART1 TX
EXP12
P2.1
UART1 RX
UART1 RX
EXP14
P2.2
GPIO
BC - Enable
P2.3
GPIO
DAC LOOPBACK0
EXP3
P2.4
GPIO
EXP13
P2.5
GPIO
UFL ADC INPUT
P2.6
GPIO
DISP - SPI CS
P3.0
GPIO
DAC LOOPBACK1
EXP5
P3.1
GPIO
EXP7
P3.2
GPIO
EXP9
P3.3
GPIO
EXP11
P3.4
GPIO
DISP - Enable
P3.7 / C2D
C2D (for debug)
Note:
1. This signal has high loading. If the MCU pin is used for signals where edge speed is critical, this signal should be disconnected
from the pin.
UG126: EFM8LB1-SLSTK2030A User's Guide
Kit Hardware Layout
silabs.com
| Building a more connected world.
Rev. 0.6 | 5