AT28HC64BF ATMEL [ATMEL Corporation], AT28HC64BF Datasheet - Page 10

• Manufacturer Part Number: AT28HC64BF
• Description: 64K (8K x 8) High Speed Parallel EEPROM with Page Write and Software Data Protection
• Manufacturer: ATMEL [ATMEL Corporation]

19. Software Data Protection Enable
Notes:
21. Software Protected Write Cycle Waveforms
Notes:
10
Algorithm
1. Data Format: I/O7 - I/O0 (Hex);
2. Write Protect state will be activated at end of write
3. Write Protect state will be deactivated at end of write
4. 1 to 64 bytes of data are loaded.
1. A6 through A12 must specify the same page address during each high to low transition of WE (or CE) after the software
2. OE must be high only when WE and CE are both low.
AT28HC64BF
Address Format: A12 - A0 (Hex).
even if no other data is loaded.
period even if no other data is loaded.
code has been entered.
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 0AAA
LAST ADDRESS
ADDRESS 1555
ADDRESS 1555
LOAD DATA AA
LOAD DATA 55
LOAD DATA A0
LOAD DATA XX
(1)
TO
TO
TO
TO
TO
A6 - A12
A0 -A5
DATA
WE
(4)
OE
CE
WRITES ENABLED
ENTER DATA
PROTECT STATE
t
AS
(2)
t
AH
t
DS
t
WP
t
DH
t
WPH
20. Software Data Protection Disable
Notes:
Algorithm
(1)(2)
1. Data Format: I/O7 - I/O0 (Hex);
2. Write Protect state will be activated at end of write
3. Write Protect state will be deactivated at end of write
4. 1 to 64 bytes of data are loaded.
Address Format: A12 - A0 (Hex).
even if no other data is loaded.
period even if no other data is loaded.
t
BLC
LOAD LAST BYTE
ANY ADDRESS
ADDRESS 0AAA
ADDRESS 0AAA
LAST ADDRESS
LOAD DATA AA
ADDRESS 1555
ADDRESS 1555
LOAD DATA AA
ADDRESS 1555
ADDRESS 1555
LOAD DATA XX
LOAD DATA 55
LOAD DATA 80
LOAD DATA 55
LOAD DATA 20
(1)
TO
TO
TO
TO
TO
TO
TO
TO
(4)
t
WC
EXIT DATA
PROTECT STATE
(3)
3648A–PEEPR–10/06