PIC18F1220ESLASHSOSQTP datasheet(143/308 Pages) MICROCHIP

143 / 308 page

DS39605F-page 141

PIC18F1220/1320

To set up an Asynchronous Transmission:

Initialize the SPBRGH:SPBRG registers for the

appropriate baud rate. Set or clear the BRGH

and BRG16 bits, as required, to achieve the

desired baud rate.

Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

If interrupts are desired, set enable bit TXIE.

If 9-bit transmission is desired, set transmit bit

TX9. Can be used as address/data bit.

Enable the transmission by setting bit TXEN,

which will also set bit TXIF.

If 9-bit transmission is selected, the ninth bit

should be loaded in bit TX9D.

Load data to the TXREG register (starts

transmission).

If using interrupts, ensure that the GIE and PEIE bits in

the INTCON register (INTCON<7:6>) are set.

FIGURE 16-2:

EUSART TRANSMIT BLOCK DIAGRAM

FIGURE 16-3:

ASYNCHRONOUS TRANSMISSION

TXIF

TXIE

Interrupt

TXEN

Baud Rate CLK

SPBRG

Baud Rate Generator

TX9D

MSb

LSb

Data Bus

TXREG Register

TSR Register

(8)

TX9

TRMT

SPEN

RB1/AN5/TX/CK/INT1 pin

Pin Buffer

and Control

• • •

SPBRGH

BRG16

Word 1

Transmit Shift Reg

Start bit

bit 0

bit 1

bit 7/8

Write to TXREG

Word 1

BRG Output

(Shift Clock)

RB1/AN5/TX/

TXIF bit

(Transmit Buffer

Reg. Empty Flag)

TRMT bit

(Transmit Shift

Reg. Empty Flag)

1 TCY

CK/INT1 (pin)

Stop bit

PIC18F1220E/SOSQTP Datasheet(PDF) 143 Page - Microchip Technology

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