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UART (Universal Asynchronous Receiver/Transmitter)
A module composed of a circuit that contains both the receiving and transmitting circuits required for asynchronous serial communication.
UL (Underwriters Laboratory)
Organization that operates laboratories to investigate systems with respect to safety.
UPS (Uninterruptible Power Supply)
A series of batteries through which the main supply is passed. Should the main supply fail, the batteries ensure continuity of power to the computer for a short time, allowing the computer to shut down in an organized way and avoiding corrupted or incomplete data files.
User memory
Memory used to store user information. The user's program, timer/counter values, input/output status, and so on, are all stored in user memory.
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