PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 336

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F66K80 FAMILY
21.4.17.3
Bus collision occurs during a Stop condition if:
a)
b)
FIGURE 21-33:
FIGURE 21-34:
DS39977C-page 336
After the SDA pin has been deasserted and
allowed to float high, SDA is sampled low after
the BRG has timed out.
After the SCL pin is deasserted, SCL is sampled
low before SDA goes high.
SDA
SCL
PEN
BCLIF
P
SSPIF
SDA
SCL
PEN
BCLIF
P
SSPIF
Bus Collision During a Stop
Condition
BUS COLLISION DURING A STOP CONDITION (CASE 1)
BUS COLLISION DURING A STOP CONDITION (CASE 2)
SDA asserted low
Assert SDA
T
BRG
T
BRG
Preliminary
T
BRG
T
BRG
The Stop condition begins with SDA asserted low.
When SDA is sampled low, the SCL pin is allowed 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 ’
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 ’
SCL goes low before SDA goes high,
set BCLIF
T
BRG
T
BRG
(Figure
 2011 Microchip Technology Inc.
21-33). If the SCL pin is
(Figure
SDA sampled
low after T
set BCLIF
‘0’
‘0’
‘0’
‘0’
21-34).
BRG
,