Datasheet
© 2011-2014 Microchip Technology Inc. DS60001168F-page 179
PIC32MX1XX/2XX
18.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The UART module is one of the serial I/O modules
available in PIC32MX1XX/2XX 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, and IrDA
®
. The UART module
also supports the hardware flow control option, with
UxCTS and UxRTS pins, and also includes an IrDA
encoder and decoder.
Key features of the UART module include:
• 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 38 bps to 12.5 Mbps at
50 MHz
• 8-level deep First In First Out (FIFO) transmit data
buffer
• 8-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
Figure 18-1 illustrates a simplified block diagram of the
UART module.
FIGURE 18-1: UART SIMPLIFIED BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the PIC32MX1XX/2XX 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)” (DS60001107) in 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
Section 4.0 “Memory Organization” 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
®
Note: Not all pins are available for all UART modules. Refer to the device-specific pin diagram for more information.