PIC18F45J50-I/SOSQTP データシートの表示（PDF） - Microchip Technology

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PIC18F45J50-I/SOSQTP

28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology

Microchip Technology 

PIC18F46J50 FAMILY

FIGURE 19-29:

BUS COLLISION DURING START CONDITION (SCLx = 0)

SDAx = 0, SCLx = 1

SDAx

TBRG

TBRG

SCLx

Set SEN, enable Start

sequence if SDAx = 1, SCLx = 1

SEN

BCLxIF

SCLx = 0 before BRG time-out,

bus collision occurs. Set BCLxIF.

S

‘0’

SSPxIF ‘0’

SCLx = 0 before SDAx = 0,

bus collision occurs. Set BCLxIF.

Interrupt cleared

in software

‘0’

‘0’

FIGURE 19-30: BRG RESET DUE TO SDAx ARBITRATION DURING START CONDITION

SDAx

SDAx = 0, SCLx = 1

Set S

Less than TBRG

TBRG

SDAx pulled low by other master.

Reset BRG and assert SDAx.

Set SSPxIF

SCLx

SEN

BCLxIF

S

SCLx pulled low after BRG

time-out

Set SEN, enable Start

sequence if SDAx = 1, SCLx = 1

‘0’

S

SSPxIF

SDAx = 0, SCLx = 1,

set SSPxIF

Interrupts cleared

in software

 2011 Microchip Technology Inc.

DS39931D-page 319

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