PIC16F882_09 Datasheet, PDF (207/328 Pages) Microchip Technology – 28/40/44-Pin, Enhanced Flash-Based 8-Bit CMOS Microcontrollers with nanoWatt Technology

PIC16F882/883/884/886/887
FIGURE 13-22: BUS COLLISION DURING START CONDITION (SCL = 0)
SDA
SDA = 0, SCL = 1
TBRG
TBRG
SCL
Set SEN, enable Start
sequence if SDA = 1, SCL = 1
SEN
BCLIF
SCL =0 before BRG time-out,
Bus collision occurs, set BCLIF
S
‘0’
SSPIF ^{‘0’}
SCL = 0 before SDA = 0,
Bus collision occurs, set BCLIF
Interrupt cleared
in software
‘0’
‘0’
FIGURE 13-23: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
SDA
SDA = 0, SCL = 1
Set S
Less than TBRG
TBRG
SDA pulled low by other master
Reset BRG and assert SDA
Set SSPIF
SCL
SEN
BCLIF
S
SCL pulled low after BRG
time-out
Set SEN, enable Start
sequence if SDA = 1, SCL = 1
‘0’
S
SSPIF
SDA = 0, SCL = 1
Set SSPIF
Interrupts cleared
in software
© 2009 Microchip Technology Inc.
DS41291F-page 205