Datasheet

© 2009 Microchip Technology Inc. Preliminary DS39937B-page 133
PIC24F04KA201 FAMILY
17.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules avail-
able in this PIC24F device family. 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. This module also
supports a hardware flow control option with the U1CTS
and U1RTS 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 U1TX and U1RX pins
• Even, Odd or No Parity Options (for 8-bit data)
• One or Two Stop bits
• Hardware Flow Control Option with U1CTS
and
U1RTS
pins
• Fully Integrated Baud Rate Generator (IBRG) with
16-Bit Prescaler
• Baud Rates Ranging from 1 Mbps to 15 bps at
16 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 (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 is displayed in
Figure 17-1. The UART module consists of these
important hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
FIGURE 17-1: UART SIMPLIFIED BLOCK DIAGRAM
Note: This data sheet summarizes the features
of this group of PIC24F devices. It is not
intended to be a comprehensive reference
source. For more information on the
Universal Asynchronous Receiver
Transmitter, refer to the “PIC24F Family
Reference Manual”, Section 21. “UART”
(DS39708).
U1RX
IrDA
®
Hardware Flow Control
UART1 Receiver
UART1 Transmitter
U1TX
U1CTS
U1RTS
U1BCLK
Baud Rate Generator