PIC16F1938 Datasheet, PDF (279/452 Pages) Microchip Technology – 28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers

PIC16(L)F1938/9
FIGURE 24-34:
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
by software
’0’
’0’
FIGURE 24-35: 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
by software
 2011 Microchip Technology Inc.
Preliminary
D41574A-page 279