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AT28C64B-15JI Datasheet(PDF) 8 Page - ATMEL Corporation

Part # AT28C64B-15JI
Description  64K (8K x 8) Parallel EEPROM with Page Write and Software Data Protection
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT28C64B-15JI Datasheet(HTML) 8 Page - ATMEL Corporation

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AT28C64B
8
Software Data Protection
Enable Algorithm(1)
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.
Software Data Protection
Disable Algorithm(1)
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 DATA AA
TO
ADDRESS 1555
LOAD DATA 55
TO
ADDRESS 0AAA
LOAD DATA A0
TO
ADDRESS 1555
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
LAST ADDRESS
ENTER DATA
PROTECT STATE
WRITES ENABLED(2)
LOAD DATA AA
TO
ADDRESS 1555
LOAD DATA 55
TO
ADDRESS 0AAA
LOAD DATA 80
TO
ADDRESS 1555
LOAD DATA AA
TO
ADDRESS 1555
LOAD DATA 20
TO
ADDRESS 1555
LOAD DATA XX
TO
ANY ADDRESS(4)
LOAD LAST BYTE
TO
LAST ADDRESS
LOAD DATA 55
TO
ADDRESS 0AAA
EXIT DATA
PROTECT STATE(3)


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