Datasheet

 2013-2014 Microchip Technology Inc. DS70000689D-page 289
dsPIC33EPXXXGM3XX/6XX/7XX
20.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
The dsPIC33EPXXXGM3XX/6XX/7XX family of
devices contains four UART modules.
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules available
in the dsPIC33EPXXXGM3XX/6XX/7XX 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. 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: UARTx SIMPLIFIED BLOCK DIAGRAM
Note 1: This data sheet summarizes the features
of the dsPIC33EPXXXGM3XX/6XX/7XX
family of devices. It is not intended to be a
comprehensive reference source. To
complement the information in this data
sheet, refer to the “dsPIC33/PIC24
Family Reference Manual”, “Universal
Asynchronous Receiver Transmitter
(UART)” (DS70000582), 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.
Note: Hardware flow control using UxRTS
and
UxCTS
is not available on all pin count
devices. See the “Pin Diagrams” section
for availability.
UxRX
UARTx Receiver
UARTx Transmitter
UxTX
Baud Rate Generator
UxRTS
/BCLKx
UxCTS
IrDA
®
Hardware Flow Control