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PIC12F1822-I/MF датащи(PDF) 271 Page - Microchip Technology

номер детали PIC12F1822-I/MF
подробное описание детали  8/14-Pin Flash Microcontrollers with nanoWatt XLP Technology
PDF  398 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC12F1822-I/MF датащи(HTML) 271 Page - Microchip Technology

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 2010 Microchip Technology Inc.
Preliminary
DS41413A-page 271
PIC12F/LF1822/16F/LF1823
24.6.13.3
Bus Collision During a Stop
Condition
Bus collision occurs during a Stop condition if:
a)
After the SDA pin has been deasserted and
allowed to float high, SDA is sampled low after
the BRG has timed out.
b)
After the SCL pin is deasserted, SCL is sampled
low before SDA goes high.
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 SSP1ADD 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 24-37). 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 24-38).
FIGURE 24-38:
BUS COLLISION DURING A STOP CONDITION (CASE 1)
FIGURE 24-39:
BUS COLLISION DURING A STOP CONDITION (CASE 2)
SDA
SCL
BCL1IF
PEN
P
SSP1IF
TBRG
TBRG
TBRG
SDA asserted low
SDA sampled
low after TBRG,
set BCL1IF
’0’
’0’
SDA
SCL
BCL1IF
PEN
P
SSP1IF
TBRG
TBRG
TBRG
Assert SDA
SCL goes low before SDA goes high,
set BCL1IF
’0’
’0’



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