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S3C6400 RISC MICROPROCESSOR
31
This chapter describes the universal asynchronous receiver/transmitter (UART) serial ports included in the
S3C6400 RSIC microprocessor.
OVERVIEW
The S3C6400 Universal Asynchronous Receiver and Transmitter (UART) provide four independent
asynchronous serial I/O (SIO) ports. Each of asynchronous serial I/O (SIO) ports can operate in interrupt-based
or DMA-based mode. In other words, the UART can generate an interrupt or a DMA request to transfer data
between CPU and the UART. The UART can support bit rates of maximum 115.2K bps using system clock. If an
external device provides the UART with EXT_UCLK0 or EXT_UCLK1, then the UART can operate at higher
speed. Each UART channel contains two 64-byte FIFOs for both reception and transmission.
The S3C6400 UART includes programmable baud rates, infra-red (IR) transmit/receive, one or two stop bit
insertion, 5-bit, 6-bit, 7-bit or 8-bit data width and parity checking.
Each UART contains a baud-rate generator, a transmitter, a receiver and a control unit, as shown in Figure 31-1.
The baud-rate generator can be clocked by PCLK , EXT_UCLK0 or EXT_UCLK1. The transmitter and the
receiver contain 64-byte FIFOs and data shifters. Data is written to FIFO and then copied to the transmit shifter
before being transmitted. The data is then shifted out by the transmit data pin (TxDn). Meanwhile, received data
is shifted from the receive data pin (RxDn), and then copied to FIFO from the shifter.
FEATURES
The UART features include:
•
RxD0, TxD0, RxD1, TxD1, RxD2, TxD2, RxD3 and TxD3 with DMA-based or interrupt-based operation
•
UART Ch 0, 1, 2 and 3 with IrDA 1.0 & 64-byte FIFO
•
UART Ch 0 and 1 with nRTS0, nCTS0, nRTS1,and nCTS1
•
Supports high-speed operation in UART Ch1 and 3
•
Supports handshake transmit/receive
UART
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
UART
31-1
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