Samsung YP-P10 User Manual download pdf (Page 332)

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101

S3C2440A RISC MICROPROCESSOR UART

11-1

11 UART

OVERVIEW

The S3C2440A Universal Asynchronous Receiver and Transmitter (UART) provide three independent asynchronous

serial I/O (SIO) ports, each of which 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 up to 115.2K bps using system clock. If an external device provides the UART with UEXTCLK, then the UART

can operate at higher speed. Each UART channel contains two 64-byte FIFOs for receiver and transmitter.

The S3C2440A UART includes programmable baud rates, infrared (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, transmitter, receiver and a control unit, as shown in Figure 11-1. The

baud-rate generator can be clocked by PCLK, FCLK/n or UEXTCLK (external input clock). 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

— RxD0, TxD0, RxD1, TxD1, RxD2, and TxD2 with DMA-based or interrupt-based operation

— UART Ch 0, 1, and 2 with IrDA 1.0 & 64-byte FIFO

— UART Ch 0 and 1 with nRTS0, nCTS0, nRTS1, and nCTS1

— Supports handshake transmit/receive

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Samsung YP-P10 User Manual Page 332

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