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AT90SCR100 Datasheet(PDF) 302 Page - ATMEL Corporation |
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AT90SCR100 Datasheet(HTML) 302 Page - ATMEL Corporation |
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302 / 433 page  302 TPR0327AY–SMS–30Jan09 AT90SCR100 address packet. Arbitration will continue until only one Master remains, and this may take many bits. If several masters are trying to address the same Slave, arbitration will continue into the data packet. Figure 22-8. 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. 22.5 Overview of the TWI Module The TWI module is comprised of several submodules, as shown in Figure 22-9. All registers drawn in a thick line are accessible through the AVR data bus. 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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