PIC16F631 datasheet(151/294 Pages) MICROCHIP

151 / 294 page

DS41262D-page 149

PIC16F631/677/685/687/689/690

12.0

ENHANCED UNIVERSAL

SYNCHRONOUS

ASYNCHRONOUS RECEIVER

TRANSMITTER (EUSART)

The Enhanced Universal Synchronous Asynchronous

Receiver Transmitter (EUSART) 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

device

program

execution.

The

EUSART, 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

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 EUSART 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

• Programmable clock polarity in synchronous

modes

The EUSART module implements the following

additional features, making it ideally suited for use in

Local Interconnect Network (LIN) bus systems:

• Automatic detection and calibration of the baud rate

• Wake-up on Break reception

• 13-bit Break character transmit

Block diagrams of the EUSART transmitter and

receiver are shown in Figure 12-1 and Figure 12-2.

FIGURE 12-1:

EUSART 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

Pin Buffer

and Control

SPBRG

SPBRGH

BRG16

FOSC

÷ n

+ 1

Multiplier

x16 x64

SYNC

1X00

BRGH

X110

BRG16

X101

Baud Rate Generator

•• •

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