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AT34C02-10TI Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT34C02-10TI Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 12 page AT34C02 8 Figure 1. Setting Write Protect Register Read Operations Read operations are initiated the same way as write opera- tions with the exception that the read/write select bit in the device address word is set to one. There are three read operations: current address read, random address read and sequential read. CURRENT ADDRESS READ: The internal data word address counter maintains the last address accessed dur- ing the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. The address “roll over” during read is from the last byte of the last memory page to the first byte of the first page. Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out. To end the command, the microcontroller does not respond with an input zero but does generate a following stop condition (refer to Figure 5). RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the microcontroller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the read/write select bit high. The EEPROM acknowledges the device address and serially clocks out the data word. To end the command, the microcontroller does not respond with a zero but does generate a following stop condition (refer to Figure 6). WP Connected to GND or Floating Start R/W Bit Write Protect Register Acknowledgment from Device Action from Device 1010 R X ACK Read Array 1010 W Programmed ACK Can Write to First Half Only 1010 W Not Programmed ACK Can Write to Full Array 0110 R Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 R Not Programmed ACK Read Out Data Don’t Care. Indicates WP Register is Not Prog 0110 W Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 W Not Programmed ACK Program Write Protect Register (irreversible) WP Connected to V CC 1010 R X ACK Read Array 1010 W Programmed ACK Device Write Protect 1010 W Not Programmed ACK Device Write Protect 0110 R Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 R Not Programmed ACK Read Out Data Don’t Care. Indicates WP Register is Not Prog 0110 W Programmed No ACK Stop - Indicates Write Protect Register is Programmed 0110 W Not Programmed ACK Cannot Program Write Protect Register S T A R T S T O P SDA LINE WORD ADDRESS DATA CONTROL BYTE A C K 01 1 0 0 A C K A C K |
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