Datasheet
2011-2013 Microchip Technology Inc. DS30001037C-page 149
PIC24F16KL402 FAMILY
18.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules
available in this PIC24F 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. 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
• Two-Level Deep, First-In-First-Out (FIFO)
Transmit Data Buffer
• Two-Level 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 module is
shown in Figure 18-1. The UART module consists of
these important hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
FIGURE 18-1: UARTx SIMPLIFIED BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive refer-
ence source. For more information on the
Universal Asynchronous Receiver
Transmitter, refer to the “dsPIC33/PIC24
Family Reference Manual”, “UART”
(DS39708).
UxRX
IrDA
®
Hardware Flow Control
UARTx Receiver
UARTx Transmitter
UxTX
UxCTS
UxRTS
UxBCLK
Baud Rate Generator