PIC18F4580-ESLASHML datasheet(231/490 Pages) MICROCHIP

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DS39637D-page 231

PIC18F2480/2580/4480/4580

19.0 ENHANCED UNIVERSAL

SYNCHRONOUS RECEIVER

TRANSMITTER (EUSART)

The Universal Synchronous Asynchronous Receiver

Transmitter (USART) module is one of the two serial

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

Communications Interface or SCI.) The USART can be

configured as a full-duplex asynchronous system that

can communicate with peripheral devices, such as

CRT terminals and personal computers. It can also be

configured as a half-duplex synchronous 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 automatic baud rate detection and calibra-

tion, automatic wake-up on Sync Break reception and

12-bit Break character transmit. These make it ideally

suited for use in Local Interconnect Network bus

(LIN/J2602 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 a USART:

• 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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