F21 datasheet(229/416 Pages) MICROCHIP

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DS30010118D-page 229

PIC24FJ256GA705 FAMILY

19.0 UNIVERSAL ASYNCHRONOUS

RECEIVER TRANSMITTER

(UART)

The Universal Asynchronous Receiver Transmitter

(UART) module is one of the serial I/O modules available

in the 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. The

module also supports a hardware flow control option

with the UxCTS and UxRTS pins. The UART module

includes an IrDA® encoder/decoder unit.

The PIC24FJ256GA705 family devices are equipped

with two UART modules, referred to as UART1 and

UART2.

The primary features of the UARTx modules 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 the UxCTS

and UxRTS Pins

• Fully Integrated Baud Rate Generator with

16-Bit Prescaler

• Baud Rates Range from up to 1 Mbps and Down to

15 Hz at 16 MIPS in 16x mode

• Baud Rates Range from up to 4 Mbps and Down to

61 Hz at 16 MIPS in 4x mode

• 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)

• Separate Transmit and Receive Interrupts

• Loopback mode for Diagnostic Support

• Polarity Control for Transmit and Receive Lines

• Support for Sync and Break Characters

• Supports Automatic Baud Rate Detection

•IrDA® Encoder and Decoder Logic

• Includes DMA Support

• 16x Baud Clock Output for IrDA Support

A simplified block diagram of the UARTx module is

shown in Figure 19-1. The UARTx module consists of

these key important hardware elements:

• Baud Rate Generator

• Asynchronous Transmitter

• Asynchronous Receiver

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, refer to

the “dsPIC33/PIC24 Family Reference

Manual”,

“Universal

Asynchronous

Receiver

Transmitter

(UART)”

(DS70000582), which is available from the

Microchip website (www.microchip.com).

The information in this data sheet

supersedes the information in the FRM.

Note:

Throughout this section, references to

ciated with a specific UART module are

referred to generically by the use of ‘x’ in

place of the specific module number.

Thus, “UxSTA” might refer to the Status

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