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Data Carriers
Section
2-2
When Executing the
Write Protect Function
Address
7
6
5
4
Bit
3
2
1
0
0002 H
YES/
NO
Leftmost two digits of beginning address
0003 H
0004 H
0005 H
Rightmost two digits of beginning address
Leftmost two digits of ending address
Rightmost two digits of ending address
The region specified by the beginning and ending addresses will be protected
when the write protect control bit (leftmost bit of address 0002 H ) is ON, as shown
in the following table.
Leftmost bit of
0002 H
ON
OFF
Write Protect Function
Data is write-protected.
Data is not write-protected.
Area that can be set:
Examples
Beginning address:
Ending address:
0006 H to 1FFF H
0006 H to 1FFF H
1, 2, 3...
1. The following settings would write-protect addresses 0015 H through 0120 H
(i.e., the beginning address to the ending addresses):
Address
Bit
Address
0002 H
0003 H
7 6
1 0
0 0
8
5 4
0 0
0 1
3 2
0 0
0 1
0
1 0
0 0
0 1
0000 H
0015 H
to
0120 H
Write-protected
addresses
1
5
0004 H
0005 H
0 0
0 0
0
0 0
1 0
0 0
0 0
1
0 1
0 0
1FFF H
2
0
2. To write-protect only 1 byte, set the same address as the start and ending
addresses (beginning address = ending address).
Address
1 byte
Write-protected address
3. If the ending address exceeds the last address of the Data Carrier memory
(ending address > 1FFF H ), the addresses up to 1FFF H will be write-pro-
tected:.
Address
0000 H
1FFF H
Write-protected addresses
4. If the beginning address is greater than the ending address (beginning
address > ending address), the write-protected area will wrap through
0006 H , so that addresses from 0006 H through the ending address,and from
the beginning address through 1FFF H will be write-protected.
11
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