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UART is Universal Asynchronous Receiver/Transmitter, the interface is EIA RS-232C DB-9. Transmitting and receiving data at the same time. There are five UART devices in SP7021 , they support the following functions:
FIFO depth can be defined: 128byte / 64byte / 16byte / 4byte: 128 byte
The internal loop-back capability allows on-board diagnostics
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