Datasheet

© 2007 Microchip Technology Inc. DS39629C-page 205
PIC18F6390/6490/8390/8490
FIGURE 16-1: AUTOMATIC BAUD RATE CALCULATION
FIGURE 16-2: 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 0000h
FFFFh
BRG Clock
ABDEN bit
RX1 pin
ABDOVF bit
BRG Value