PIC18F6410ESLASHPTSQTP datasheet(211/404 Pages) MICROCHIP

211 / 404 page

 2004 Microchip Technology Inc.

Preliminary

DS39635A-page 209

PIC18F6310/6410/8310/8410

17.0

ENHANCED UNIVERSAL

SYNCHRONOUS

ASYNCHRONOUS RECEIVER

TRANSMITTER (EUSART)

PIC18F6310/6410/8310/8410

devices

have

three

serial I/O modules: the MSSP module, discussed in the

previous chapter and two Universal Synchronous

Asynchronous Receiver Transmitter (USART) mod-

ules. (Generically, the 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, etc.

There are two distinct implementations of the USART

module in these devices: the Enhanced USART

(EUSART), discussed here and the Addressable

USART, discussed in the next chapter. For this device

family, USART1 always refers to the EUSART, while

USART2 is always the AUSART.

The EUSART and AUSART modules implement the

same core features for serial communications; their

basic operation is essentially the same. The EUSART

module provides additional features, including auto-

matic 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/TX1/CK1 and

RC7/RX1/DT1 as a USART:

• bit SPEN (RCSTA1<7>) must be set (= 1)

• bit TRISC<7> must be set (= 1)

• bit TRISC<6> must be set (= 1)

The operation of the Enhanced USART module is

controlled through three registers:

• Transmit Status and Control Register 1 (TXSTA1)

• Receive Status and Control Register 1 (RCSTA1)

• Baud Rate Control Register 1 (BAUDCON1)

The

registers

are

described

Note:

The USART control will automatically

reconfigure the pin from input to output as

needed.

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