PIC12F1822T-I/SL 查看數據表（PDF） - Microchip Technology

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PIC12F1822T-I/SL

8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC12F/LF1822/16F/LF1823

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

BCL1IF

SCL = 0 before BRG time-out,

bus collision occurs. Set BCL1IF.

S

’0’

SSP1IF ’0’

SCL = 0 before SDA = 0,

bus collision occurs. Set BCL1IF.

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 SSP1IF

SCL

SEN

BCL1IF

S

SCL pulled low after BRG

time-out

Set SEN, enable Start

sequence if SDA = 1, SCL = 1

’0’

S

SSP1IF

SDA = 0, SCL = 1,

set SSP1IF

Interrupts cleared

by software

 2010 Microchip Technology Inc.

Preliminary

DS41413A-page 269

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