PIC18F4685-ISLASHSP datasheet(229/484 Pages) MICROCHIP

229 / 484 page

Preliminary

DS39761B-page 227

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

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

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

and

respectively.

Note:

The EUSART control will automatically

reconfigure the pin from input to output as

needed.

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