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AT30TSE754-XM8-T Datasheet(PDF) 39 Page - ATMEL Corporation |
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AT30TSE754-XM8-T Datasheet(HTML) 39 Page - ATMEL Corporation |
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39 / 60 page  39 Atmel AT30TSE752/754/758 [DATASHEET] 8751D–DTS–8/2012 10.4.2 Random Read Random Read operations allow the Master to access any memory location in a random manner and requires a “dummy write” sequence to preload the byte address of the data byte to be read. To perform this type of Read operation, the data byte address must first be set. This is accomplished by sending the device address byte and the word address byte to the AT30TSE752/754/758 as part of a Write operation or “dummy write” sequence. Once the word address byte is sent, the Master generates a Start condition following the ACK. This terminates the Write operation but not before the AT30TSE752/754/758’s internal address pointer is set. This is the reason it is called a “dummy write” sequence as its only purpose is to preload the starting byte address to be read from. The Master then issues the device address byte again, but with the R/W bit set to a logic “1” state. The AT30TSE752/754/758 will ACK and transmit the data byte. The Master will NACK and generate a Stop condition and the AT30TSE752/754/758 will discontinue the transmission. Figure 10-4. Random Read from Serial EEPROM SCL SDA Start by Master ACK from Slave ACK from Slave Device Address Byte Word Address Byte MSB MSB 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 0 1 0 A A/P1 A/P0 0 0 0 0 0 0 0 0 0 0 0 Dummy Write Start by Master ACK from Slave NACK from Master Device Address Byte Data Byte (n) Stop by Master MSB MSB 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 0 1 0 A A/P1 A/P0 1 0 D7 D6 D5 D4 D3 D2 D1 D0 1 |
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