DSPIC33FJ64GP706 datasheet(187/322 Pages) MICROCHIP

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DS70286C-page 185

dsPIC33FJXXXGPX06/X08/X10

18.0 UNIVERSAL ASYNCHRONOUS

RECEIVER TRANSMITTER

(UART)

The Universal Asynchronous Receiver Transmitter

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

available

the

dsPIC33FJXXXGPX06/X08/X10

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 1 Mbps to 15 bps at 16x

mode at 40 MIPS

• Baud rates ranging from 4 Mbps to 61 bps at 4x mode

at 40 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

• 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 shown in

Figure 18-1. The UART module consists of the key

important hardware elements:

• Baud Rate Generator

• Asynchronous Transmitter

• Asynchronous Receiver

FIGURE 18-1:

UART SIMPLIFIED BLOCK DIAGRAM

Note:

This data sheet summarizes the features

of the dsPIC33FJXXXGPX06/X08/X10

family of devices. However, it is not

intended to be a comprehensive reference

source. To complement the information in

this data sheet, refer to Section 17.

“UART” (DS70188) in the “dsPIC33F

Family Reference Manual”, which is

available from the Microchip web site

(www.microchip.com).

Note 1: Both UART1 and UART2 can trigger a DMA data transfer. If U1TX, U1RX, U2TX or U2RX is selected as

a DMA IRQ source, a DMA transfer occurs when the U1TXIF, U1RXIF, U2TXIF or U2RXIF bit gets set as

a result of a UART1 or UART2 transmission or reception.

2: If DMA transfers are required, the UART TX/RX FIFO buffer must be set to a size of 1 byte/word (i.e.,

UTXISEL<1:0> = 00 and URXISEL<1:0> = 00).

UxRX

Hardware Flow Control

UART Receiver

UART Transmitter

UxTX

BCLK

Baud Rate Generator

UxRTS

IrDA®

UxCTS

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