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AT34C02CN-SH-T Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT34C02CN-SH-T Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 25 page 11 5185D–SEEPR–1/08 AT34C02C Table 7-3. WP Connected to GND or Floating Table 7-4. WP Connected to Vcc WP Connected to GND or Floating Command R/W Bit Permanent Write Protect Register PSWP Reversible Write Protect Register RSWP Acknowledgme nt from Device Action from Device 1010 R X X ACK 1010 W Programmed X ACK Can write to second Half (80H - FFH) only 1010 W X Programmed ACK Can write to second Half (80H - FFH) only 1010 W Not Programmed Not Programmed ACK Can write to full array Read PSWP R Programmed X No ACK STOP - Indicates permanent write protect register is programmed Read PSWP R Not Programmed X ACK Read out data don't care. Indicates PSWP register is not programmed Set PSWP W Programmed X No ACK STOP - Indicates permanent write protect register is programmed Set PSWP W Not Programmed X ACK Program permanent write protect register (irreversible) Read RSWP R X Programmed No ACK STOP - Indicates reversible write protect register is programmed Read RSWP R X Not Programmed ACK Read out data don't care. Indicates RSWP register is not programmed Set RSWP W X Programmed No ACK STOP - Indicates reversible write protect register is programmed Set RSWP W X Not Programmed ACK Program reversible write protect register (reversible) Clear RSWP W Programmed X No ACK STOP - Indicates permanent write protect register is programmed Clear RSWP W Not Programmed X ACK Clear (unprogram) reversible write protect register (reversible) WP Connected to Vcc Comman d R/W Bit Permanent Write Protect Register PSWP Reversible Write Protect Register RSWP Acknowledgme nt from Device Action from Device 1010 R X X ACK Read array 1010 W X X ACK Device Write Protect Read PSWP R Programmed X No ACK STOP - Indicates permanent write protect register is programmed Read PSWP R Not Programmed X ACK Read out data don't care. Indicates PSWP register is not programmed |
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