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Data Carriers
Section
2-2
2-2-2 Memory Map
The Data Carrier (DC) has a memory area of up to 8K bytes. Each address of the
memory area specifies one byte. A single byte of data can be written to one
address.
Address
0000 H
0001 H
0002 H
to
0005 H
0006 H
to
00FF H
0100 H
Data
Production date area
Write protect setting area
to
8K
to
01FF H
to
0700 H
to
1FFF H
Leftmost digit
to
to
to
Rightmost digit
1 byte
Production Date Area (Written by Maker)
Address
Bit
7
6
5
4
3
2
1
0
0000 H
0001 H
Month (10s digit)
Year (10s digit)
Month (1s digit)
Year (1s digit)
Note
1. Address 0000 contains the month of production (March → “ 03, ” Octo-
ber → “ 10 ” ).
2. Address 0001 contains the lower two digits of the year (1997 → “ 97 ” ).
3. This area is read only.
The memory is SRAM, so there is no limit on the number of times that data can
be read or overwritten.
The memory capacity is 8 KB, and the available addresses are 0000 H to 1FFF H .
The memory contents are preserved by a long-life lithium battery.
2-2-3 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 being overwritten inad-
vertently. With this function, the data in a specified memory area can be pro-
tected. It is recommended that important data be write-protected as follows:
Setting the Write Protect Function
The write protect function is set in the four bytes of addresses 0002 H through
0005 H of the Data Carrier ’ s memory. The status of the leftmost bit of address
0002 H determines whether or not the write protect function is in effect.
10
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