PIC18LF4682-I/ML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC18LF4682-I/ML

28/40/44-Pin Enhanced Flash Microcontrollers with ECAN™ Technology, 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F2682/2685/4682/4685

18.0 ENHANCED UNIVERSAL

SYNCHRONOUS RECEIVER

TRANSMITTER (EUSART)

The Enhanced Universal Synchronous Asynchronous

Receiver Transmitter (EUSART) module is one of the

two serial I/O modules. (USART is also known as a

Serial Communications Interface or SCI.) The

EUSART can be configured as a full-duplex asynchro-

nous system that can communicate with peripheral

devices, such as CRT terminals and personal comput-

ers. It can also be configured as a half-duplex synchro-

nous system that can communicate with peripheral

devices, such as A/D or D/A integrated circuits, serial

EEPROMs and so on.

The EUSART module implements additional features,

including Auto-Baud Rate Detection and calibration,

automatic wake-up on Sync Break reception and 12-bit

Break character transmit. These features make it

ideally suited for use in Local Interconnect Network bus

(LIN bus) systems.

The EUSART can be configured in the following

modes:

• Asynchronous (full duplex) with:

- Auto-Wake-up on Character Reception

- Auto-Baud Calibration

- 12-Bit Break Character Transmission

• Synchronous – Master (half duplex) with

Selectable Clock Polarity

• Synchronous – Slave (half duplex) with

Selectable Clock Polarity

The pins of the Enhanced USART are multiplexed

with PORTC. In order to configure RC6/TX/CK and

RC7/RX/DT as an EUSART:

• bit SPEN (RCSTA<7>) must be set (= 1)

• bit TRISC<7> must be set (= 1)

• bit TRISC<6> must be cleared (= 0) for

Asynchronous and Synchronous Master modes,

or set (= 1) for Synchronous Slave mode

Note:

The EUSART control will automatically

reconfigure the pin from input to output as

needed.

The operation of the Enhanced USART module is

controlled through three registers:

• Transmit Status and Control (TXSTA)

• Receive Status and Control (RCSTA)

• Baud Rate Control (BAUDCON)

These are detailed on the following pages in

Register 18-1, Register 18-2 and Register 18-3,

respectively.

© 2007 Microchip Technology Inc.

Preliminary

DS39761B-page 227

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