Microchip Technology MA240017 Data Sheet

 2008-2011 Microchip Technology Inc.

DS39927C-page 147

The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules avail-
able in this PIC24F device family. The UART is a
full-duplex asynchronous system that can communicate
with peripheral devices, such as personal computers,
LIN, 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 (9

th

 

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 UART is displayed in

. The UART module consists of these

important hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver

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 Universal Asynchronous Receiver
Transmitter, refer to the “PIC24F Family
Reference Manual”

, Section 21. “UART”

(DS39708).

UxRX

IrDA

®

Hardware Flow Control

UARTx Receiver

UARTx Transmitter

UxTX

UxCTS

UxRTS

UxBCLK

Baud Rate Generator