DSPIC30F datasheet(99/220 Pages) MICROCHIP

99 / 220 page

 2004 Microchip Technology Inc.

Preliminary

DS70116C-page 97

dsPIC30F5011/5013

16.0

UNIVERSAL ASYNCHRONOUS

RECEIVER TRANSMITTER

(UART) MODULE

This section describes the Universal Asynchronous

Receiver/Transmitter Communications module.

16.1

UART Module Overview

The key features of the UART module are:

• Full-duplex, 8 or 9-bit data communication

• Even, odd or no parity options (for 8-bit data)

• One or two Stop bits

• Fully integrated baud rate generator with 16-bit

prescaler

• Baud rates range from 38 bps to 1.875 Mbps at a

30 MHz instruction rate

• 4-word deep transmit data buffer

• 4-word deep receive data buffer

• Parity, framing and buffer overrun error detection

• Support for interrupt only on address detect

(9th bit = 1)

• Separate transmit and receive interrupts

• Loopback mode for diagnostic support

FIGURE 16-1:

UART TRANSMITTER BLOCK DIAGRAM

Write

UTX8

UxTXREG Low Byte

Load TSR

Transmit Control

– Control TSR

– Control Buffer

– Generate Flags

– Generate Interrupt

Control and Status bits

UxTXIF

Data

‘0’ (Start)

‘1’ (Stop)

Parity

Generator

Transmit Shift Register (UxTSR)

16 Divider

Control

Signals

16x Baud Clock

from Baud Rate

Generator

Internal Data Bus

UTXBRK

UxTX

Note:

x = 1 or 2.

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