PIC16F720-ESLASHML datasheet(119/244 Pages) MICROCHIP

119 / 244 page

 2010 Microchip Technology Inc.

DS41430A-page 119

PIC16F/LF720/721

16.0

ADDRESSABLE UNIVERSAL

SYNCHRONOUS

ASYNCHRONOUS RECEIVER

TRANSMITTER (AUSART)

The

Addressable

Universal

Synchronous

Asynchronous

Receiver

Transmitter

(AUSART)

module is a serial I/O communications peripheral. It

contains all the clock generators, shift registers and

data buffers necessary to perform an input or output

serial data transfer independent of device program

execution. The AUSART, also known as a Serial

Communications Interface (SCI), can be configured as

a full-duplex asynchronous system or half-duplex

synchronous system. Full-Duplex mode is useful for

communications with peripheral systems, such as CRT

terminals

and

personal

computers.

Half-Duplex

Synchronous mode is intended for communications

with peripheral devices, such as A/D or D/A integrated

circuits, serial EEPROMs or other microcontrollers.

These devices typically do not have internal clocks for

baud rate generation and require the external clock

signal provided by a master synchronous device.

The AUSART module includes the following capabilities:

• Full-duplex asynchronous transmit and receive

• Two-character input buffer

• One-character output buffer

• Programmable 8-bit or 9-bit character length

• Address detection in 9-bit mode

• Input buffer overrun error detection

• Received character framing error detection

• Half-duplex synchronous master

• Half-duplex synchronous slave

• Sleep operation

Block diagrams of the AUSART transmitter and

receiver are shown in Figure 16-1 and Figure 16-2.

FIGURE 16-1:

AUSART TRANSMIT BLOCK DIAGRAM

TXIF

TXIE

Interrupt

TXEN

TX9D

MSb

LSb

Data Bus

TXREG Register

Transmit Shift Register (TSR)

(8)

TX9

TRMT

SPEN

TX/CK

Pin Buffer

and Control

SPBRG

FOSC

÷ n

+ 1

Multiplier

x16

x64

SYNC

100

BRGH

x10

Baud Rate Generator

•• •

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