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ATmega644PA Datasheet(PDF) 214 Page - ATMEL Corporation |
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ATmega644PA Datasheet(HTML) 214 Page - ATMEL Corporation |
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214 / 468 page  214 8152G–AVR–11/09 ATmega164PA/324PA/644PA/1284P bits. If several masters are trying to address the same Slave, arbitration will continue into the data packet. Figure 20-8. 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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