Datasheet

© 2009 Microchip Technology Inc. DS39682E-page 189
PIC18F45J10 FAMILY
FIGURE 16-27: BUS COLLISION DURING START CONDITION (SCLx = 0)
FIGURE 16-28: BRG RESET DUE TO SDAx ARBITRATION DURING START CONDITION
SDAx
SCLx
SEN
bus collision occurs. Set BCLxIF.
SCLx = 0 before SDAx = 0,
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1
TBRG
TBRG
SDAx = 0, SCLx = 1
BCLxIF
S
SSPxIF
Interrupt cleared
in software
bus collision occurs. Set BCLxIF.
SCLx = 0 before BRG time-out,
‘0’‘0’
‘0’‘0’
SDAx
SCLx
SEN
Set S
Less than TBRG
TBRG
SDAx = 0, SCLx = 1
BCLxIF
S
SSPxIF
S
Interrupts cleared
in software
set SSPxIF
SDAx = 0, SCLx = 1,
SCLx pulled low after BRG
time-out
Set SSPxIF
‘0’
SDAx pulled low by other master.
Reset BRG and assert SDAx.
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1