Microchip Technology DM183037 Data Sheet

Page of 696
PIC18F97J94 FAMILY
DS30575A-page 420
 2012 Microchip Technology Inc.
FIGURE 21-1:
AUTOMATIC BAUD RATE CALCULATION
FIGURE 21-2:
BRG OVERFLOW SEQUENCE
BRG Value
RXx Pin
ABDEN bit
RCxIF bit
Bit 0
Bit 1
(Interrupt)
Read
RCREGx
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
001Ch
Note: The ABD sequence requires the EUSARTx module to be configured in Asynchronous mode and WUE = 0.
SPBRGx
XXXXh
1Ch
SPBRGHx
XXXXh
00h
Edge #5
Stop Bit
Start
Bit 0
XXXXh
0000h
0000h
FFFFh
BRG Clock
ABDEN bit
RXx Pin
ABDOVF bit
BRG Value