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AT24C01C 数据表(PDF) 22 Page - Microchip Technology |
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AT24C01C 数据表(HTML) 22 Page - Microchip Technology |
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22 / 45 page ![]() Figure 8-2. Random Read SCL SDA Start by Master 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 2 A 1 A 0 0 0 Dummy Write Start by Master Device Address Byte Data Word (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 2 A 1 A 0 1 0 D7 D6 D5 D4 D3 D2 D1 D0 1 A7 A6 A5 A4 A3 A2 A1 A0 0 ACK from Slave ACK from Slave ACK from Slave NACK from Master 8.3 Sequential Read Sequential reads are initiated by either a current address read or a random read. After the bus master receives a data word, it responds with an Acknowledge. As long as the EEPROM receives an ACK, it will continue to increment the word address and serially clock out sequential data words. When the maximum memory address is reached, the data word address will roll-over and the sequential read will continue from the beginning of the memory array. All types of read operations will be terminated if the bus master does not respond with an ACK (it NACKs) during the ninth clock cycle. After the NACK response, the master may send a Stop condition to complete the protocol, or it can send a Start condition to begin the next sequence. Figure 8-3. Sequential Read SCL SDA Start by Master ACK from Slave ACK from Master Device Address Byte Data Word (n) 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 2 A 1 A 0 1 0 D7 D6 D5 D4 D3 D2 D1 D0 0 ACK from Master NACK from Master Stop by Master ACK from Master Data Word (n+1) Data Word (n+2) Data Word (n+x) 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 D7 D6 D5 D4 D3 D2 D1 D0 0 D7 D6 D5 D4 D3 D2 D1 D0 0 D7 D6 D5 D4 D3 D2 D1 D0 1 MSB MSB MSB AT24C01C/AT24C02C Read Operations © 2018 Microchip Technology Inc. Datasheet DS20006111A-page 22 |
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