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PIC18F23K22-E/ML Datasheet(PDF) 252 Page - Microchip Technology

No. de pieza PIC18F23K22-E/ML
Descripción Electrónicos  28/40/44-Pin, Low-Power, High-Performance Microcontrollers with nanoWatt XLP Technology
PDF  496 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

PIC18F23K22-E/ML Datasheet(HTML) 252 Page - Microchip Technology

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PIC18(L)F2X/4XK22
DS41412C-page 252
Preliminary
 2010 Microchip Technology Inc.
15.6.13.3
Bus Collision During a Stop
Condition
Bus collision occurs during a Stop condition if:
a)
After the SDAx pin has been deasserted and
allowed to float high, SDAx is sampled low after
the BRG has timed out.
b)
After the SCLx pin is deasserted, SCLx is
sampled low before SDAx goes high.
The Stop condition begins with SDAx asserted low.
When SDAx is sampled low, the SCLx pin is allowed to
float. When the pin is sampled high (clock arbitration),
the Baud Rate Generator is loaded with SSPxADD and
counts down to 0. After the BRG times out, SDAx is
sampled. If SDAx is sampled low, a bus collision has
occurred. This is due to another master attempting to
drive a data ‘0’ (Figure 15-37). If the SCLx pin is
sampled low before SDAx is allowed to float high, a bus
collision occurs. This is another case of another master
attempting to drive a data ‘0’ (Figure 15-38).
FIGURE 15-38:
BUS COLLISION DURING A STOP CONDITION (CASE 1)
FIGURE 15-39:
BUS COLLISION DURING A STOP CONDITION (CASE 2)
SDAx
SCLx
BCLxIF
PEN
P
SSPxIF
TBRG
TBRG
TBRG
SDAx asserted low
SDAx sampled
low after TBRG,
set BCLxIF
’0’
’0’
SDAx
SCLx
BCLxIF
PEN
P
SSPxIF
TBRG
TBRG
TBRG
Assert SDAx
SCLx goes low before SDAx goes high,
set BCLxIF
’0’
’0’



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