Microchip Technology ARD00330 データシート

 2010 Microchip Technology Inc.

Preliminary

DS39979A-page 247

PIC18F87J72 FAMILY

FIGURE 19-1:

AUTOMATIC BAUD RATE CALCULATION

FIGURE 19-2:

BRG OVERFLOW SEQUENCE

BRG Value

RX1 Pin

ABDEN bit

RC1IF bit

bit 0

bit 1

(Interrupt)

Read

RCREG1

BRG Clock

Start

Auto-Cleared

Set by User

XXXXh

0000h

Edge #1

bit 2

bit 3

Edge #2

bit 4

bit 5

Edge #3

bit 6

bit 7

Edge #4

Stop bit

Edge #5

001Ch

Note: The ABD sequence requires the EUSART module to be configured in Asynchronous mode and WUE = 0.

SPBRG1

XXXXh

1Ch

SPBRGH1

XXXXh

00h

Start

bit 0

XXXXh

0000h

FFFFh

BRG Clock

ABDEN bit

RX1 Pin

ABDOVF bit

BRG Value