87
RFID System
User’s Manual
SECTION 4
Write Protection
SECTION 4
Functions
Setting Write Protection for V600 S-RAM Model
(Setting the V600 Write Protection Method and Using the V680-D2K/8K/32K@@)
When the start address and end address for write protection are written into ID Tag addresses 0002H
to 0005H, the area from the start address to the end address is write-protected.
The most significant bit of address 0002H is used to enable or disable write protection.
In V600 S-RAM write protection, addresses 0000H and 0001H are always write-protected regardless of
whether write protection is enabled or disabled.
The V600 EEPROM write protection method and the V600 S-RAM write protection method can be used only on ID Con-
trollers that are version 2.1 or newer. For details on Checking the Version, refer to page 17.
Memory Map for V600 S-RAM ID Tag Write Protection Settings
• Most Significant Bit of Address 0002
H
1: Write-protected (Enabled)
0: Not write-protected (Disabled)
• Area in ID Tag Memory That Can Be Write Protected
Start address: 0006H to 7FFFH
End address: 0006H to FFFFH
To use write protection, one operation to write to the write protection setting area (addresses 0002H to 0005H) and a
separate operation to write to other addresses (address 0006
H or higher). A write protection error will occur if the most
significant bit of address 0002
H is 1 and a write operation is performed that includes both addresses in the ID tag write
protection settings area and other addresses in the ID Tag.
Address Bit 7 6 5 4 3 2 1 0
0002
H
Enable/
disable
Upper two digits of start address (00 to 7F)
0003
H Lower two digits of start address (00 to FF)
0004
H Upper two digits of end address (00 to FF)
0005
H Lower two digits of end address (00 to FF)
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