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2008 Microchip Technology Inc.

DS39626E-page 201

PIC18F2525/2620/4525/4620

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. (Generically, the USART is also

known as a Serial Communications Interface or SCI.)

The EUSART 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, etc.

The Enhanced USART module implements additional

features, including automatic baud rate detection and

calibration, automatic wake-up on Sync Break recep-

tion and 12-bit Break character transmit. These 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 a USART:

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

TRISC<7> bit must be set (= 1)

TRISC<6> bit must be set (= 1)

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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