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AT29C512-70 Datasheet(PDF) 11 Page - ATMEL Corporation |
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AT29C512-70 Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 12 page 11 0456H–FLASH–2/05 AT29C512 18. 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 activated at end of program cycle. 3. Data Protect state will be deactivated at end of pro- gram period. 4. 128 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 (128 BYTES)(4) WRITES ENABLED ENTER DATA PROTECT STATE(2) 19. 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 (128 BYTES)(4) EXIT DATA PROTECT STATE(3) 20. Software Protected Program Cycle Waveform (1)(2)(3) Notes: 1. A7 through A15 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 sector being programmed will be indeterminate. OE (1) CE WE DATA (3) BYTE 0 BYTE 126 BYTE 127 t DH t BLC t DS t WP t WPH t AH A0-A6 A7-A15 (2) t WC 5555 2AAA 5555 AA 55 A0 t AS SECTOR ADDRESS BYTE ADDRESS |
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