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3.18. UART interface

Three UARTs (SER0, SER1, and SER2) are provided by the ARM926PXP development chip.

The UARTs have the following features:

  • port function corresponds to the DTE configuration

  • SER1 and SER2 (UART1 and UART2) have only CTS, RTS, TXD and RXD signals.

  • SER0 (UART0) has CTS, RTS, DCD, DSR, DTR, and RI control signals

  • programmable baud rates of up to 1.5Mbits per second (the line drivers however, are only guaranteed to 250kbps)

  • 16-byte transmit FIFO

  • 16-byte receive FIFO

  • four programmable interrupts.

Signals from UART1 and UART2 go to the expansion connector. The signals from UART0 are converted from logic level to RS232 level by MAX3243E buffers as shown in Figure 3.31.

Figure 3.31. UARTs block diagram

UARTs block diagram

See also UART and the ARM PrimeCell UART (PL011) Technical Reference Manual.

The signals associated with the UART interface are shown in Table 3.17.

Table 3.17. Serial interface signal assignment
Signal Description
UARTxTXDTransmit data
UARTxRTSReady to send
UARTxDTRData terminal ready
UARTxCTSClear to send
UARTxDSRData set ready
UARTxDCDData carrier detect
UARTxRXDReceive data
UARTxRIRing indicator

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