16F87 datasheet(107/228 Pages) MICROCHIP

107 / 228 page

 2005 Microchip Technology Inc.

DS30487C-page 105

PIC16F87/88

When setting up an asynchronous reception, follow

these steps:

Initialize the SPBRG register for the appropriate

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

set bit BRGH (Section 11.1 “AUSART Baud

Rate Generator (BRG)”).

Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

If interrupts are desired, then set enable bit

RCIE.

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

Enable the reception by setting bit CREN.

Flag bit RCIF will be set when reception is com-

plete and an interrupt will be generated if enable

bit RCIE is set.

Read the RCSTA register to get the ninth bit (if

enabled) and determine if any error occurred

during reception.

Read the 8-bit received data by reading the

RCREG register.

If any error occurred, clear the error by clearing

enable bit CREN.

10. If using interrupts, ensure that GIE and PEIE

(bits 7 and 6) of the INTCON register are set.

TABLE 11-8:

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

0Bh, 8Bh,

10Bh,18Bh

INTCON

GIE

PEIE

TMR0IE INT0IE

RBIE

TMR0IF

INT0IF

RBIF

0000 000x

0000 000u

0Ch

PIR1

—

ADIF(1)

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF

-000 0000

18h

RCSTA

SPEN

RX9

SREN

CREN

ADDEN

FERR

OERR

RX9D

0000 000x

1Ah

RCREG AUSART Receive Data Register

0000 0000

8Ch

PIE1

—

ADIE(1)

RCIE

TXIE

SSPIE

CCP1IE

TMR2IE TMR1IE

-000 0000

98h

TXSTA

CSRC

TX9

TXEN

SYNC

—BRGH

TRMT

TX9D

0000 -010

99h

SPBRG

Baud Rate Generator Register

0000 0000

Legend:

= unknown, - = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous reception.

Note

This bit is only implemented on the PIC16F88. The bit will read ‘0’ on the PIC16F87.

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