Datasheet

PIC18F2525/2620/4525/4620
DS39626E-page 210 © 2008 Microchip Technology Inc.
FIGURE 18-1: AUTOMATIC BAUD RATE CALCULATION
FIGURE 18-2: BRG OVERFLOW SEQUENCE
BRG Value
RX pin
ABDEN bit
RCIF bit
Bit 0
Bit 1
(Interrupt)
Read
RCREG
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.
SPBRG
XXXXh 1Ch
SPBRGH
XXXXh
00h
Start Bit 0
XXXXh 0000h 0000h
FFFFh
BRG Clock
ABDEN bit
RX pin
ABDOVF bit
BRG Value