PIC18F44J10 datasheet(193/368 Pages) MICROCHIP

193 / 368 page

DS39682E-page 191

PIC18F45J10 FAMILY

16.4.17.3

Bus Collision During a Stop

Condition

Bus collision occurs during a Stop condition if:

After the SDAx pin has been deasserted and

allowed to float high, SDAx is sampled low after

the BRG has timed out.

After the SCLx pin is deasserted, SCLx is

sampled low before SDAx goes high.

The Stop condition begins with SDAx asserted low.

When SDAx is sampled low, the SCLx pin is allowed to

float. When the pin is sampled high (clock arbitration),

the

Baud

Rate

Generator

loaded

with

SSPxADD<6:0> and counts down to 0. After the BRG

times out, SDAx is sampled. If SDAx is sampled low, a

bus collision has occurred. This is due to another

master attempting to drive a data ‘0’ (Figure 16-31). If

the SCLx pin is sampled low before SDAx is allowed to

float high, a bus collision occurs. This is another case

of another master attempting to drive a data ‘0’

(Figure 16-32).

FIGURE 16-31:

BUS COLLISION DURING A STOP CONDITION (CASE 1)

FIGURE 16-32:

BUS COLLISION DURING A STOP CONDITION (CASE 2)

SDAx

SCLx

BCLxIF

PEN

SSPxIF

TBRG

SDAx asserted low

SDAx sampled

low after TBRG,

set BCLxIF

‘0’

SDAx

SCLx

BCLxIF

PEN

SSPxIF

TBRG

Assert SDAx

SCLx goes low before SDAx goes high,

set BCLxIF

‘0’

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