PIC24HJXXXGPX06A Datasheet, PDF (175/294 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
18.0 UNIVERSAL ASYNCHRONOUS
RECEIVER TRANSMITTER
(UART)
Note:
This data sheet summarizes the features
of the PIC24HJXXXGPX06A/X08A/X10A
family of devices. However, it is not
intended to be a comprehensive reference
source. To complement the information in
this data sheet, refer to the “PIC24H
Family Reference Manual”, Section 17.
“UART” (DS70232), which is available
from the Microchip website
(www.microchip.com).
The Universal Asynchronous Receiver Transmitter
(UART) module is one of the serial I/O modules avail-
able in the PIC24HJXXXGPX06A/X08A/X10A 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 inter-
faces. The module also supports a hardware flow con-
trol 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
Baud Rate Generator
IrDA^®
BCLK
Hardware Flow Control
UART Receiver
UxRTS
UxCTS
UxRX
UART Transmitter
UxTX
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).
© 2009 Microchip Technology Inc.
Preliminary
DS70592A-page 173