PIC16LF870-I/SO 데이터 시트보기 (PDF) - Microchip Technology

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PIC16LF870-I/SO

28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

Microchip Technology 

PIC16F870/871

9.2.3 SETTING UP 9-BIT MODE WITH ADDRESS

DETECT

Steps to follow when setting up an Asynchronous

Reception with Address Detect Enabled:

• Initialize the SPBRG register for the appropriate

baud rate. If a high speed baud rate is desired, set

bit BRGH.

• Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

• If interrupts are desired, then set enable bit RCIE.

• Set bit RX9 to enable 9-bit reception.

• Set ADDEN to enable address detect.

• Enable the reception by setting enable bit CREN.

• Flag bit RCIF will be set when reception is com-

plete, and an interrupt will be generated if enable

bit RCIE was set.

• Read the RCSTA register to get the ninth bit and

determine if any error occurred during reception.

• Read the 8-bit received data by reading the

RCREG register, to determine if the device is

being addressed.

• If any error occurred, clear the error by clearing

enable bit CREN.

• If the device has been addressed, clear the

ADDEN bit to allow data bytes and address bytes

to be read into the receive buffer, and interrupt the

CPU.

FIGURE 9-6: USART RECEIVE BLOCK DIAGRAM

x64 Baud Rate CLK

SPBRG

Baud Rate Generator

CREN

÷ 64

or

÷ 16

RC7/RX/DT

Pin Buffer

and Control

Data

Recovery

OERR

FERR

MSb

RSR register

Stop (8) 7 • • • 1

LSb

0 Start

RX9

8

SPEN

RX9

ADDEN

RX9

ADDEN

RSR<8>

Enable

Load of

Receive

Buffer

8

RX9D

RCREG Register

FIFO

Interrupt

RCIF

RCIE

8

Data Bus

© 1999 Microchip Technology Inc.

Preliminary

DS30569A-page 71

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