PIC18F4550-IP Datasheet, PDF (254/438 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
FIGURE 20-1:
AUTOMATIC BAUD RATE CALCULATION
BRG Value
XXXXh
RX pin
0000h
Start
Edge #1
bit 0 ^{bit 1}
Edge #2
bit 2 ^{bit 3}
Edge #3
bit 4 ^{bit 5}
Edge #4
bit 6 ^{bit 7}
001Ch
Edge #5
Stop bit
BRG Clock
Set by User
ABDEN bit
RCIF bit
(Interrupt)
Read
RCREG
SPBRG
XXXXh
SPBRGH
XXXXh
Note: The ABD sequence requires the EUSART module to be configured in Asynchronous mode and WUE = 0.
Auto-Cleared
1Ch
00h
FIGURE 20-2:
BRG OVERFLOW SEQUENCE
BRG Clock
ABDEN bit
RX pin
ABDOVF bit
BRG Value
XXXXh
Start
bit 0
0000h
FFFFh
0000h
DS39632E-page 252
© 2009 Microchip Technology Inc.