4-2
Section
Memory Map of Data Carrier
28
4-2
Memory Map of Data Carrier
4-2-1 Memory Map
The Data Carrier (DC) has a memory area of up to 8 KB. Data of 1 byte can be
written to an address of the memory area.
0000
0001
0002
to
0005
0006
to
00FF
0100
to
01FF
to
0700
to
07FF
to
1F00
to
1FFF
to
to
to
to
to
to
Address
Data
Higher digits
Lower digits
1 byte
2 KB
2 KB
Production date area
Write protect setting area
Note Addresses 0000 and 0001 form a production date area in which data is facto-
ry-set for shipment. Addresses 0002 through 0005 are used to set write protec-
tion.
4-2-2 Format of Production Date (Written by Manufacturer)
To manage the battery life of the Data Carrier, the date of production is written to
the first 2-byte area of the Data Carrier memory as a factory-set condition for
shipment. The data in this area can be read, but no data can be written to this
area by the user. If a write operation is performed on this area by mistake, an
error will occur.
Contents of Production Date Area
Address
Bit
7
6
5
4
3
2
1
0
0000
Digit 10 of month
Digit 1 of month
0001
Digit 10 of year
Digit 1 of year
Note
1. Lower 2 digits of year are recorded (1991 –> “91”).
2. Month is expressed in two digits (June –> “06,” October –> “10”).
