X28HC64DI-12 INTERSIL [Intersil Corporation], X28HC64DI-12 Datasheet - Page 8

• Manufacturer Part Number: X28HC64DI-12
• Description: 5 Volt, Byte Alterable EEPROM
• Manufacturer: INTERSIL [Intersil Corporation]

RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
Figure 9. Software Sequence to Deactivate Software
Data Protection
V
WE
CE
CC
ADDR
Data
Write Data AA
Write Data AA
Write Data 20
Write Data 55
Write Data 80
Write Data 55
1555
AAA
to Address
to Address
to Address
to Address
to Address
Address
0AAA
0AAA
1555
1555
1555
1555
8
0AAA
55
1555
80
X28HC64
1555
AA
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an EEPROM programmer, the following six step algo-
rithm will reset the internal protection circuit. After t
the X28HC64 will be in standard operating mode.
Note: Once initiated, the sequence of write operations
should not be interrupted.
0AAA
55
1555
20
≥t
WC
Standard
Operating
Mode
June 1, 2005
FN8109.0
WC
,