Datasheet

© 2009-2012 Microchip Technology Inc. Preliminary DS70616F-page 351
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
20.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The dsPIC33EPXXX(GP/MC/MU)806/810/814 and
PIC24EPXXX(GP/GU)810/814 family of devices
contain four UART modules.
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules
available in the dsPIC33EPXXX(GP/MC/MU)806/810/
814 and PIC24EPXXX(GP/GU)810/814 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. 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- 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 4.375 Mbps to 67 bps at 16x
mode at 70 MIPS
• Baud rates ranging from 17.5 Mbps to 267 bps at 4x
mode at 70 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 20-1. The UART module consists of
these key hardware elements:
• Baud Rate Generator
• Asynchronous Transmitter
• Asynchronous Receiver
FIGURE 20-1: UART SIMPLIFIED BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXX(GP/MC/MU)806/
810/814 and PIC24EPXXX(GP/GU)810/
814 families 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”
(DS70582) of the “dsPIC33E/PIC24E
Family Reference Manual”, which is
available from 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.
UxRX
Hardware Flow Control
UART Receiver
UART Transmitter
UxTX
Baud Rate Generator
UxRTS
IrDA
®
UxCTS