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AT28HC64B-90JI Datasheet(PDF) 8 Page - ATMEL Corporation |
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AT28HC64B-90JI Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 12 page Software Protected Write Cycle Waveforms (1, 2) Notes: 1. A6 through A12 must specify the same page address during each high to low transition of WE (or CE) after the software code has been entered. 2. OE must be high only when WE and CE are both low. LOAD LAST BYTE TO LAST ADDRESS LOAD DATA A0 TO ADDRESS 1555 LOAD DATA 55 TO ADDRESS 0AAA LOAD DATA AA TO ADDRESS 1555 Notes for software program code: 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A12 - A0 (Hex). 2. Write Protect state will be activated at end of write even if no other data is loaded. 3. Write Protect state will be deactivated at end of write period even if no other data is loaded. 4. 1 to 64-bytes of data are loaded. ENTER DATA PROTECT STATE WRITES ENABLED (2) Software Data Protection Enable Algorithm (1) LOAD DATA XX TO ANY ADDRESS (4) LOAD LAST BYTE TO LAST ADDRESS LOAD DATA 55 TO ADDRESS 0AAA LOAD DATA AA TO ADDRESS 1555 LOAD DATA 80 TO ADDRESS 1555 LOAD DATA 55 TO ADDRESS 0AAA LOAD DATA AA TO ADDRESS 1555 LOAD DATA 20 TO ADDRESS 1555 EXIT DATA PROTECT STATE (3) Software Data Protection Disable Algorithm (1) LOAD DATA XX TO ANY ADDRESS (4) 2-274 AT28HC64B |
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