MPC8540 datasheet(480/1302 Pages) FREESCALE

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MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

12-2

Freescale Semiconductor

DUART

Figure 12-1. UART Block Diagram

12.1.1 Features

The DUART includes these distinctive features:

•

Full-duplex operation

•

Programming model compatible with the original PC16450 UART and the PC16550D (an

improved version of the PC16450 that also operates in FIFO mode)

•

PC16450 register reset values

•

FIFO mode for both transmitter and receiver, providing 16-byte FIFOs

•

Serial data encapsulation and decapsulation with standard asynchronous communication

bits (START, STOP, and parity)

•

Maskable transmit, receive, line status, and MODEM status interrupts

•

Software-programmable baud generators that divide the CCB clock by 1 to (216 – 1) and

generate a 16x clock for the transmitter and receiver engines

•

Clear to send (CTS) and ready to send (RTS) MODEM control functions

•

Software-selectable serial interface data format (data length, parity, 1/1.5/2 STOP bit, baud

rate)

•

Line and MODEM status registers

•

Line-break detection and generation

Receive Buffer

Input Port

Output Port

Address Bus

Control

Data

16-Bit Counter/

Baud Rate Generator

RTS

SIN

SOUT

Interrupt

Control

Logic

Control

Transmit Buffer

CTS

CCB_clk

HRESET

int

MPC8540 Datasheet(PDF) 480 Page - Freescale Semiconductor, Inc

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