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Memory Map of Data Carrier
4-2-3 Write Protect Function
Setting Write Protect Function
Example: June, 1991
Address
0000
0001
Note The battery life of the Data Carrier can be managed not only by reading the stick-
er on the battery, but also by the host computer through software by using a read
command.
The write protect function protects important data stored in the memory of the
Data Carrier, such as product number and model, from inadvertent write access.
With this function, the data in a specified memory area can be protected. It is
recommended that important data be write-protected as follows:
The write protect function is set by 4 bytes of the addresses 0002 through 0005
of the Data Carrier's memory. Whether or not the write protect function is ef-
fected is specified by the most significant bit of address 0002.
Address
7
0002
YES/
NO
0003
Lower 2 digits of start address
0004
Higher 2 digits of end address
0005
Lower 2 digits of end address
Write protect execution bit (most significant bit of address 0002)
1: Write-protected
0: Not write-protected
Setting area:
Address
Start address
0006 to 07FF
End address
0006 to 07FF
Note Use addresses 0002 through 0005 as a write protect area.
To protect addresses 0006 through 07FF:
Address
0002
1
0003
0
0004
0
0005
1
Bit
7
6
5
4
0
0
0
0
0
1
0
0
1
9
6
5
4
Higher 2 digits of start address
2 KB type
8 KB type
0006 to 1FFF
0006 to 1FFF
Higher digits
0
0
0
0
8
0
0
0
0
0
0
0
0
0
0
1
1
1
1
F
Section
3
2
1
0
0
1
1
0
6
0
0
0
1
1
Bit
3
2
1
Lower digits
0
0
0
0
1
1
0
6
1
1
1
7
1
1
1
F
4-2
0
29
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