Rev. 1.10

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Universal Synchronous Asynchronous Receiver Transmitter (USART)

The Universal Synchronous Asynchronous Receiver Transceiver, USART, provides a flexible

full duplex data exchange using synchronous or asynchronous transfer. The USART is used to

translate data between parallel and serial interfaces, and is also commonly used for RS232 standard

communication. The USART peripheral function supports five-types of interrupt including Line

Status Interrupt, Transmitter FIFO Empty Interrupt, Receiver Threshold Level Reaching Interrupt,

Time Out Interrupt and MODEM Status Interrupt. The USART module includes a 16-byte

transmitter FIFO, (TX_FIFO) and a 16-byte receiver FIFO (RX_FIFO).

Software can detect a USART error status by reading the Line Status Register, LSR. The status

includes the type and the condition of transfer operations as well as several error conditions

resulting from Parity, Overrun, Framing and Break events.

The USART includes a programmable baud rate generator which is capable of dividing the

CK_AHB to produce a clock for the USART transmitter and receiver.

Debug Support

Package and Operation Temperature