Datasheet
© 2008-2012 Microchip Technology Inc. DS70318F-page 231
dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04
18.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules
available in the dsPIC33FJ06GS101/X02 and
dsPIC33FJ16GSX02/X04 device families. 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. 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 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 with 16-bit
Prescaler
• Baud Rates Ranging from 12.5 Mbps to 38 bps at
50 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 UART 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 UART module is
shown in Figure 1. The UART module consists of these
key hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
FIGURE 1: UART SIMPLIFIED BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33FJ06GS101/X02 and
dsPIC33FJ16GSX02/X04 family of
devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to Section 17. “UART”
(DS70188) in the “dsPIC33F/PIC24H
Family Reference Manual”, which is
available on the Microchip web site
(www.microchip.com).
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.
U1RX
Hardware Flow Control
UART Receiver
UART Transmitter
U1TX
Baud Rate Generator
U1RTS/BCLK1
IrDA
®
U1CTS