PIC24FV32KA302-ISLASHML datasheet(177/364 Pages) MICROCHIP

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DS39995D-page 177

PIC24FV32KA304 FAMILY

18.0 UNIVERSAL ASYNCHRONOUS

RECEIVER TRANSMITTER

(UART)

The Universal Asynchronous Receiver Transmitter

(UART) module is one of the serial I/O modules

available in this PIC24F device family. The UART is a

full-duplex, asynchronous system that can communicate

with peripheral devices, such as personal computers,

LIN/J2602, RS-232 and RS-485 interfaces. This module

also supports a hardware flow control option with the

UxCTS and UxRTS pins, and also includes an IrDA®

encoder and decoder.

The primary features of the UART module are:

• Full-Duplex, 8-Bit or 9-Bit Data Transmission

through the UxTX and UxRX Pins

• Even, Odd or No Parity Options (for 8-bit data)

• One or Two Stop bits

• Hardware Flow Control Option with UxCTS and

UxRTS pins

• Fully Integrated Baud Rate Generator (IBRG) with

16-Bit Prescaler

• Baud Rates Ranging from 1 Mbps to 15 bps at

16 MIPS

• 4-Deep, First-In-First-Out (FIFO) Transmit Data

Buffer

• 4-Deep FIFO Receive Data Buffer

• Parity, Framing and Buffer Overrun Error

Detection

• Support for 9-Bit mode with Address Detect

(9th bit = 1)

• Transmit and Receive Interrupts

• Loopback mode for Diagnostic Support

• Support for Sync and Break Characters

• Supports Automatic Baud Rate Detection

•IrDA® Encoder and Decoder Logic

• 16x Baud Clock Output for IrDA Support

A simplified block diagram of the UARTx is shown in

Figure 18-1. The UARTx module consists of these

important hardware elements:

• Baud Rate Generator

• Asynchronous Transmitter

• Asynchronous Receiver

FIGURE 18-1:

UARTx SIMPLIFIED BLOCK DIAGRAM

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information on the Univer-

sal Asynchronous Receiver Transmitter,

refer to the “PIC24F Family Reference

Manual”, Section 21. “UART” (DS39708).

Note:

Throughout this section, references to

ciated with a specific USART module are

referred to generically by the use of ‘x’ in

place of the specific module number.

Thus, “UxSTA” might refer to the USART

Status register for either USART1 or

USART2.

UxRX

IrDA®

Hardware Flow Control

UARTx Receiver

UARTx Transmitter

UxTX

UxCTS

UxRTS

UxBCLK

Baud Rate Generator

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