4-2
Section
Memory Map of Data Carrier
29
Example: June, 1991
Address
Bit
7
6
5
4
3
2
1
0
0000
0
0
0
0
0
1
1
0
0
6
0001
1
0
0
1
0
0
0
1
9
1
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.
4-2-3 Write Protect Function
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:
Setting Write Protect Function
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
Bit
7
6
5
4
3
2
1
0
0002
YES/
NO
Higher 2 digits of start address
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
2 KB type
8 KB type
Start address
0006 to 07FF
0006 to 1FFF
End address
0006 to 07FF
0006 to 1FFF
Note Use addresses 0002 through 0005 as a write protect area.
To protect addresses 0006 through 07FF:
Address
Higher digits
Lower digits
0002
1
0
0
0
0
0
0
0
8
0
0003
0
0
0
0
0
1
1
0
0
6
0004
0
0
0
0
0
1
1
1
0
7
0005
1
1
1
1
1
1
1
1
F
F
