EFM8UB1 Datasheet, PDF (37/59 Pages) Silicon Laboratories – The EFM8UB1 highlighted features are listed below

Pin
Number
27
Pin Name
P0.3
28
P0.2
Center
GND
Description
Multifunction I/O
Multifunction I/O
Ground
Crossbar Capability
Additional Digital
Functions
Yes
P0MAT.3
EXTCLK
INT0.3
INT1.3
Yes
P0MAT.2
INT0.2
INT1.2
EFM8UB1 Data Sheet
Pin Definitions
Analog Functions
ADC0.3
CMP0P.3
CMP0N.3
ADC0.2
CMP0P.2
CMP0N.2
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