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ATmega328P датащи(PDF) 236 Page - ATMEL Corporation |
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ATmega328P датащи(HTML) 236 Page - ATMEL Corporation |
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236 / 448 page ![]() 236 8161D–AVR–10/09 ATmega48PA/88PA/168PA/328P Figure 21-16. Formats and States in the Slave Receiver Mode 21.7.4 Slave Transmitter Mode In the Slave Transmitter mode, a number of data bytes are transmitted to a Master Receiver (see Figure 21-17). All the status codes mentioned in this section assume that the prescaler bits are zero or are masked to zero. Figure 21-17. Data Transfer in Slave Transmitter Mode S SLA W A DATA A $60 $80 $88 A $68 Reception of the own slave address and one or more data bytes. All are acknowledged Last data byte received is not acknowledged Arbitration lost as master and addressed as slave Reception of the general call address and one or more data bytes Last data byte received is not acknowledged n From master to slave From slave to master Any number of data bytes and their associated acknowledge bits This number (contained in TWSR) corresponds to a defined state of the 2-Wire Serial Bus. The prescaler bits are zero or masked to zero P or S DATA A $80 $A0 P or S A ADATAA $70 $90 $98 A $78 P or S DATA A $90 $A0 P or S A General Call Arbitration lost as master and addressed as slave by general call DATA A Device 3 Device n SDA SCL ........ R1 R2 V CC Device 2 MASTER RECEIVER Device 1 SLAVE TRANSMITTER |
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