PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 164

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
FIGURE 15-22: BUS COLLISION DURING START CONDITION (SCL = 0)
FIGURE 15-23: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
DS30475A-page 164
SDA
SCL
SEN
S
BCLIF
SSPIF
S
BCLIF
SSPIF
SDA
SCL
SEN
’0’
’0’
SCL = 0 before BRG time-out,
Bus collision occurs, set BCLIF
Set SEN, enable START
sequence if SDA = 1, SCL = 1
SDA pulled low by other master
Reset BRG and assert SDA
Less than T
BRG
SDA = 0, SCL = 1
SDA = 0, SCL = 1
Advanced Information
T
BRG
SDA = 0, SCL = 1
Set SSPIF
Set SEN, enable START
sequence if SDA = 1, SCL = 1
S
Set S
T
BRG
T
BRG
SCL = 0 before SDA = 0,
Bus collision occurs, set BCLIF
Set SSPIF
SCL pulled low after BRG
Time-out
Interrupt cleared
in software
’0’
’0’
Interrupts cleared
in software
 2000 Microchip Technology Inc.
’0’