PIC17C75X
FIGURE 15-39: BUS COLLISION DURING START CONDITION (SCL = 0)
SDA = 0, SCL = 1
TBRG
TBRG
SDA
SCL
SEN
Set SEN, enable start
sequence if SDA = 1, SCL = 1
SCL = 0 before SDA = 0,
Bus collision occurs, Set BCLIF.
SCL = 0 before BRG time out,
Bus collision occurs, Set BCLIF.
BCLIF
Interrupts cleared
in software.
S
SSPIF
FIGURE 15-40: BRG RESET DUE TO SDA COLLISION DURING START CONDITION
SDA = 0, SCL = 1
Set S, SSPIF
TBRG
Less than TBRG
SDA goes low early.
Reset BRG and assert SDA
SDA
SCL
Set SEN, enable start
sequence if SDA = 1, SCL = 1
S
SEN
BCLIF
S
SSPIF
Interrupts cleared
in software.
SDA = 0, SCL = 1
Set S, SSPIF
DS30264A-page 162
Preliminary
1997 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
