PIC12F1516 MICROCHIP [Microchip Technology], PIC12F1516 Datasheet - Page 229
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PIC12F1516
Manufacturer Part Number
PIC12F1516
Description
28/40/44-Pin Flash Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC12F1516.pdf
(344 pages)
- Current page: 229 of 344
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21.6.13.3
Bus collision occurs during a Stop condition if:
a)
b)
FIGURE 21-38:
FIGURE 21-39:
2011 Microchip Technology Inc.
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 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’
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’
PIC16(L)F1516/7/8/9
SCL goes low before SDA goes high,
set BCLIF
T
(Figure
BRG
T
BRG
21-37). If the SCL pin is sampled
(Figure
SDA sampled
low after T
set BCLIF
’0’
’0’
DS41452B-page 229
’0’
’0’
21-38).
BRG
,
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