PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 166
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PIC18C658
Manufacturer Part Number
PIC18C658
Description
High-Performance Microcontrollers with CAN Module
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18C658.pdf
(366 pages)
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PIC18CXX8
15.4.16.3 Bus Collision During a STOP Condition
Bus collision occurs during a STOP condition if:
a)
b)
FIGURE 15-26: BUS COLLISION DURING A STOP CONDITION (CASE 1)
FIGURE 15-27: BUS COLLISION DURING A STOP CONDITION (CASE 2)
DS30475A-page 166
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.
SDA
SCL
PEN
BCLIF
P
SSPIF
SSPIF
BCLIF
PEN
SDA
SCL
P
Assert SDA
T
SDA asserted low
BRG
T
BRG
Advanced Information
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’ (Figure 15-26). 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 attempt-
ing to drive a data ’0’ (Figure 15-27).
SCL goes low before SDA goes high,
set BCLIF
T
BRG
T
BRG
2000 Microchip Technology Inc.
’0’
’0’
SDA sampled
low after T
set BCLIF
’0’
’0’
BRG
,
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