MPC8540 datasheet(479/1302 Pages) FREESCALE

Part #	MPC8540

Description	MPC8540 PowerQUICC III??Integrated Host Processor Reference Manual

PDF	1302 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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479 / 1302 page

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

Freescale Semiconductor

12-1

Chapter 12

DUART

This chapter describes the dual universal asynchronous receiver/transmitters (DUART) of the

MPC8540. It describes the functional operation, the DUART initialization sequence, and the

programming details for the DUART registers and features.

12.1 Overview

The DUART of the MPC8540 consists of two universal asynchronous receiver/transmitters

(UARTs). The UARTs act independently; all references to UART refer to one of these

receiver/transmitters. Each UART is clocked by the core complex bus (CCB) clock. The DUART

programming model is compatible with the PC16552D.

The UART interface is point to point, meaning that only two UART devices are attached to the

connecting signals. As shown in Figure 12-1, each UART module consists of the following:

•

Receive and transmit buffers

•

Clear to send (CTS) input port and request to send (RTS) output port for data flow control

•

16-bit counter for baud rate generation

•

Interrupt control logic

MPC8540 Datasheet(PDF) 479 Page - Freescale Semiconductor, Inc