PIC18CXX2_13 Datasheet, PDF (146/304 Pages) Microchip Technology – High Performance Microcontrollers with 10-bit A/D

PIC18CXX2
FIGURE 14-25: BUS COLLISION DURING START CONDITION (SCL = 0)
SDA = 0, SCL = 1
SDA
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 14-26: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
SDA = 0, SCL = 1
Set S
Less than TBRG
TBRG
SDA 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
DS39026D-page 146
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