PIC18F23K22 Datasheet, PDF (250/492 Pages) Microchip Technology – 28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology

PIC18(L)F2X/4XK22
FIGURE 15-34:
BUS COLLISION DURING START CONDITION (SCLx = 0)
SDAx = 0, SCLx = 1
SDAx
TBRG
TBRG
SCLx
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1
SEN
BCLxIF
SCLx = 0 before BRG time-out,
bus collision occurs. Set BCLxIF.
S
’0’
SSPxIF ^{’0’}
SCLx = 0 before SDAx = 0,
bus collision occurs. Set BCLxIF.
Interrupt cleared
by software
’0’
’0’
FIGURE 15-35: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
SDAx
SDAx = 0, SCLx = 1
Set S
Less than TBRG
TBRG
SDAx pulled low by other master.
Reset BRG and assert SDAx.
Set SSPxIF
SCLx
SEN
BCLxIF
S
SCLx pulled low after BRG
time-out
Set SEN, enable Start
sequence if SDAx = 1, SCLx = 1
’0’
S
SSPxIF
SDAx = 0, SCLx = 1,
set SSPxIF
Interrupts cleared
by software
DS41412B-page 250
Preliminary
 2010 Microchip Technology Inc.