Microchip Technology MA320001 Data Sheet

© 2011 Microchip Technology Inc.

DS61143H-page 115

The UART module is one of the serial I/O modules
available in PIC32MX3XX/4XX family devices. The
UART is a full-duplex, asynchronous communication
channel that communicates with peripheral devices
and personal computers through protocols such as RS-
232, RS-485, LIN 1.2 and IrDA

®

. The module also sup-

ports the hardware flow control option, with 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

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

• One or two Stop bits

• Hardware auto-baud feature

• Hardware flow control option

• Fully integrated Baud Rate Generator (BRG) with 

16-bit prescaler

• Baud rates ranging from 76 bps to 20 Mbps at 80 

MHz

• 4-level-deep First-In-First-Out (FIFO) Transmit 

Data Buffer

• 4-level-deep FIFO 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

• LIN protocol support

• IrDA encoder and decoder with 16x baud clock 

output for external IrDA encoder/decoder support

 illustrates a simplified block diagram of the

UART.

1: This data sheet summarizes the features

of the PIC32MX3XX/4XX family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 21. “Universal
Asynchronous Receiver Transmitter
(UART)” (DS61107) of the “PIC32 Family
Reference Manual”,  which is available
from the Microchip web site
(

www.microchip.com/PIC32

).

2: 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.

Baud Rate Generator

UxRX

Hardware Flow Control

UARTx Receiver

UARTx Transmitter

UxTX

UxCTS

UxRTS

BCLKx

IrDA

®