PIC16F1847_13 Datasheet, PDF (275/440 Pages) Microchip Technology – 18/20/28-Pin Flash Microcontrollers with XLP Technology

PIC16(L)F1847
FIGURE 25-34:
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 25-35: 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
 2011-2013 Microchip Technology Inc.
Preliminary
DS40001453D-page 275