PIC18F4539 Datasheet, PDF (163/322 Pages) Microchip Technology – Enhanced FLASH Microcontrollers with Single Phase Induction Motor Control Kernel

PIC18FXX39
FIGURE 16-27:
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 16-28: BRG RESET DUE TO SDA ARBITRATION DURING START CONDITION
SDA
SDA = 0, SCL = 1
Less than TBRG
Set S
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
 2002 Microchip Technology Inc.
Preliminary
DS30485A-page 161