PIC17C752-08SLASHP datasheet(164/320 Pages) MICROCHIP

164 / 320 page

PIC17C75X

DS30264A-page 164

Preliminary

15.2.14.3 BUS COLLISION DURING A STOP

CONDITION

Bus collision occurs during a STOP condition if:

After the SDA pin has been de-asserted and

allowed to ﬂoat high, SDA is sampled low after

the BRG has timed out.

After the SCL pin is de-asserted, SCL is sam-

pled low before SDA goes high.

The STOP condition begins with SDA asserted low.

When SDA is sampled low, the SCL pin is allow to

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

the baud rate generator is loaded with SSPADD<6:0>

and counts down to 0. After the BRG times out SDA is

sampled. If SDA is sampled low, a bus collision has

occurred. This is due to another master attempting to

drive a data '0'. If the SCL pin is sampled low before

SDA is allowed to ﬂoat high, a bus collision occurs.

This is another case of another master attempting to

drive a data '0'. (Figure 15-43)

FIGURE 15-43: BUS COLLISION DURING A STOP CONDITION (CASE 1)

FIGURE 15-44: BUS COLLISION DURING A STOP CONDITION (CASE 2)

SDA

SCL

BCLIF

PEN

SSPIF

TBRG

SDA asserted low

SDA sampled

low after TBRG,

Set BCLIF

SDA

SCL

BCLIF

PEN

SSPIF

TBRG

Assert SDA

SCL goes low before SDA goes high

Set BCLIF

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