Motorola G24 Developer's Manual page 82

Abbreviation
S
S SIM
SPI
S
U
UART
U
U USB
UUT
U
Acr & Abbr-2
Subscriber Identity Module
Serial Peripheral Interface
Universal Asynchronous Receiver Transmitter
Universal Serial Bus
Unit Under Test
Developer's Kit
Full Name
S - U
April 1, 2006