79C0832
8 Megabit (256K x 32-Bit) EEPROM MCM
5. Writing to the Memory with Software Data Protection Enabled
To write to the device once Software protection is enabled, the enable sequence must precede the data to be written. This
sequence allows the write to occur while at the same time keeping the software protection enabled
Sequence for Writing Data with Software Protection Enabled.
Address
Data
5555
AA AA AA AA
55 55 55 55
AAAA or 2AAA
5555
A0 A0 A0 A0
Write Address(s)
Normal Data Input
6. Disabling Software Protection
Software data protection mode can be disabled by inputting the following 6 bytes sequence. Once the software protection
sequence has been written, no data can be written to the memory until the write cycle (TWC) has elapsed.
Software Protection Disable Sequence
Address
Data
5555
AA AA AA AA
55 55 55 55
AAAA or 2AAA
80 80 80 80
AA AA AA AA
5555
5555
AAAA or 2AAA
5555
55 55 55 55
20 20 20 20
Devices are shipped in the “unprotected” state, meaning that the contents of the memory can be changed as
required by the user. After the software data protection is enabled, the device enters the Protect Mode
where no further write commands have any effect on the memory contents.
All data sheets are subject to change without notice
02.14.06 REV 15
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©2006 Maxwell Technologies
All rights reserved
MAXWELL [ MAXWELL TECHNOLOGIES ]
