PIC16F870-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F870-I/SO

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

Microchip Technology 

PIC16F870/871

Steps to follow when setting up an Asynchronous

Reception:

1. Initialize the SPBRG register for the appropriate

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

set bit BRGH. (Section 9.1).

2. Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

3. If interrupts are desired, then set enable bit

RCIE.

4. If 9-bit reception is desired, then set bit RX9.

5. Enable the reception by setting bit CREN.

6. Flag bit RCIF will be set when reception is com-

plete and an interrupt will be generated if enable

bit RCIE is set.

7. Read the RCSTA register to get the ninth bit (if

enabled) and determine if any error occurred

during reception.

8. Read the 8-bit received data by reading the

RCREG register.

9. If any error occurred, clear the error by clearing

enable bit CREN.

TABLE 9-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION

Address Name Bit 7

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1

Bit 0

Value on:

POR,

BOR

Value on

all other

Resets

0Ch

PIR1

PSPIF(1) ADIF

RCIF TXIF

— CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000

18h

RCSTA SPEN

RX9 SREN CREN — FERR OERR RX9D 0000 -00x 0000 -00x

1Ah

RCREG USART Receive Register

0000 0000 0000 0000

8Ch

PIE1

PSPIE(1) ADIE

RCIE TXIE

— CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000

98h

TXSTA CSRC

TX9

TXEN SYNC — BRGH TRMT TX9D 0000 -010 0000 -010

99h

SPBRG Baud Rate Generator Register

0000 0000 0000 0000

Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for asynchronous reception.

Note 1: Bits PSPIE and PSPIF are reserved on the PIC16F870; always maintain these bits clear.

DS30569A-page 70

Preliminary

© 1999 Microchip Technology Inc.

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