Software Data
Software Data
Protection Enable Algorithm (1)
Protection Disable Algorithm (1)
LOAD DATA AA
TO
LOAD DATA AA
TO
ADDRESS 5555
ADDRESS 5555
LOAD DATA 55
TO
LOAD DATA 55
TO
ADDRESS 2AAA
ADDRESS 2AAA
LOAD DATA 80
TO
LOAD DATA A0
TO
ADDRESS 5555
ADDRESS 5555
WRITES ENABLED
LOAD DATA AA
TO
ADDRESS 5555
LOAD DATA
TO
SECTOR (256 BYTES)
ENTER DATA
(4)
(2)
PROTECT STATE
LOAD DATA 55
TO
ADDRESS 2AAA
Notes for software program code:
1. Data Format: I/O7 - I/O0 (Hex);
Address Format: A14 - A0 (Hex).
LOAD DATA 20
TO
ADDRESS 5555
2. Data Protect state will be activated at end of program cycle.
3. Data Protect state will be deactivated at end of program
period.
EXIT DATA
PROTECT STATE
(3)
4. 256-bytes of data MUST BE loaded.
LOAD DATA
TO
(4)
SECTOR (256 BYTES)
Software Protected Program Cycle Waveform(1, 2, 3)
Notes: 1. A8 through A17 must specify the sector address
during each high to low transition of WE (or CE)
after the software code has been entered.
3. All bytes that are not loaded within the sector being
programmed will be indeterminate.
2. OE must be high when WE and CE are both low.
8
AT29C020
ATMEL [ ATMEL ]
