PIC17C75X Datasheet, PDF (162/320 Pages) Microchip Technology – High-Performance 8-Bit CMOS EPROM Microcontrollers

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