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ATmega16 датащи(PDF) 177 Page - ATMEL Corporation |
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ATmega16 датащи(HTML) 177 Page - ATMEL Corporation |
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177 / 357 page ![]() 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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