Microchip Technology MA330031-2 Data Sheet

 2011-2013 Microchip Technology Inc.

DS70000657H-page 281

The dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X and PIC24EPXXXGP/MC20X family of devices
contains two UART modules.
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules available
in the dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/
50X and PIC24EPXXXGP/MC20X 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.
The 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 UARTx module are:
• Full-Duplex, 8 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 with 16-Bit 

Prescaler

• Baud Rates Ranging from 4.375 Mbps to 67 bps at 

16x mode at 70 MIPS

• Baud Rates Ranging from 17.5 Mbps to 267 bps at 

4x mode at 70 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
• A Separate Interrupt for all UARTx Error Conditions
• Loopback mode for Diagnostic Support
• Support for Sync and Break Characters
• Support for Automatic Baud Rate Detection
• IrDA

®

 Encoder and Decoder Logic

• 16x Baud Clock Output for IrDA Support
A simplified block diagram of the UARTx module is
shown in 

. The UARTx module consists of

these key hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver

This data sheet summarizes the
features of the dsPIC33EPXXXGP50X,
dsPIC33EPXXXMC20X/50X and
PIC24EPXXXGP/MC20X families of
devices. It is not intended to be a compre-
hensive reference source. To complement
the information in this data sheet, refer to
“UART”

 (DS70582) in the “dsPIC33/

”, which is

available from the Microchip web site
(

www.microchip.com

).

Some registers and associated bits
described in this section may not be
available on all devices. Refer to

 in

this data sheet for device-specific register
and bit information.

Hardware flow control using UxRTS and
UxCTS is not available on all pin count
devices. See the 

 section

for availability.

UxRX

Hardware Flow Control

UARTx Receiver

UARTx Transmitter

UxTX

Baud Rate Generator

UxRTS/BCLKx

UxCTS

IrDA

®