PIC16F87X Datasheet

  • PIC16F87X

  • 28/40-pin 8-Bit CMOS FLASH Microcontrollers

  • 1377.31KB

  • Microchip

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PIC16F87X
FIGURE 9-21: BUS COLLISION DURING START CONDITION (SCL = 0)
SDA = 0, SCL = 1
T
BRG
SDA
T
BRG
SCL
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.
SEN
BCLIF
Interrupts cleared
in software.
S
SSPIF
鈥?鈥?/div>
鈥?鈥?/div>
鈥?鈥?/div>
鈥?鈥?/div>
FIGURE 9-22: BRG RESET DUE TO SDA COLLISION DURING START CONDITION
SDA = 0, SCL = 1
Set S
Less than T
BRG
SDA
SDA pulled low by other master.
Reset BRG and assert SDA
T
BRG
Set SSPIF
SCL
s
SCL pulled low after BRG
Timeout
Set SEN, enable start
sequence if SDA = 1, SCL = 1
SEN
BCLIF
鈥?鈥?/div>
S
SSPIF
SDA = 0, SCL = 1
Set SSPIF
Interrupts cleared
in software.
DS30292A-page 90
1999 Microchip Technology Inc.

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