X28HC64 Xicor, X28HC64 Datasheet - Page 8

• Manufacturer Part Number: X28HC64
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28HC64
RESETTING SOFTWARE DATA PROTECTION
Figure 8. Reset Software Data Protection Timing Sequence
Figure 9. Software Sequence to
Deactivate Software Data Protection
Vcc
WE
CE
ADDR
DATA
1555
WRITE DATA 55
WRITE DATA 55
WRITE DATA 20
WRITE DATA AA
WRITE DATA AA
AA
WRITE DATA 80
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
TO ADDRESS
0AAA
0AAA
1555
1555
1555
1555
0AAA
55
1555
80
3857 ILL F19.2
1555
AA
8
In the event the user wants to deactivate the software
data protection feature for testing or reprogramming in
an E
rithm will reset the internal protection circuit. After t
the X28HC64 will be in standard operating mode.
Note:
0AAA
55
2
PROM programmer, the following six step algo-
Once initiated, the sequence of write operations
should not be interrupted.
1555
20
t WC
STANDARD
OPERATING
MODE
3857 ILL F18.2
WC
,