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ATmega16 Fiches technique(PDF) 177 Page - ATMEL Corporation

No de pièce ATmega16
Description  8-bit Microcontroller with 16K Bytes In-Syustem Programmable Flash
PDF  357 Pages
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Fabricant  ATMEL [ATMEL Corporation]
Site Internet  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATmega16 Fiches technique(HTML) 177 Page - ATMEL Corporation

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177
2466S–AVR–05/09
ATmega16(L)
Figure 83. Arbitration between Two Masters
Note that arbitration is not allowed between:
•
A REPEATED START condition and a data bit
•
A STOP condition and a data bit
•
A REPEATED START and a STOP condition
It is the user software’s responsibility to ensure that these illegal arbitration conditions never
occur. This implies that in multi-master systems, all data transfers must use the same composi-
tion of SLA+R/W and data packets. In other words: All transmissions must contain the same
number of data packets, otherwise the result of the arbitration is undefined.
SDA from
Master A
SDA from
Master B
SDA Line
Synchronized
SCL Line
START
Master A Loses
Arbitration, SDA
A
SDA



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