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AT29C256-12PI Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT29C256-12PI Datasheet(HTML) 10 Page - ATMEL Corporation |
10 / 12 page 10 AT29C256 0046P–FLASH–10/04 Software Data Protection Enable Algorithm(1) Notes: 1. Data Format: I/O7 - I/O0 (Hex); Address Format: A14 - A0 (Hex). 2. Data Protect state will be re-activated at end of pro- gram cycle. 3. Data Protect state will be deactivated at end of pro- gram period. 4. 64 bytes of data MUST BE loaded. LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA A0 TO ADDRESS 5555 LOAD DATA TO PAGE (64 BYTES)(4) WRITES ENABLED(2) ENTER DATA PROTECT STATE Software Data Protection Disable Algorithm(1) LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 80 TO ADDRESS 5555 LOAD DATA AA TO ADDRESS 5555 LOAD DATA 55 TO ADDRESS 2AAA LOAD DATA 20 TO ADDRESS 5555 LOAD DATA TO PAGE (64 BYTES)(4) EXIT DATA PROTECT STATE(3) Software Protected Program Cycle Waveform (1)(2)(3) Notes: 1. A6 through A14 must specify the page address during each high-to-low transition of WE (or CE) after the software code has been entered. 2. OE must be high when WE and CE are both low. 3. All bytes that are not loaded within the page being programmed will be indeterminate. |
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