User's Manual

3-4 Lock Function
3-4
3-7
The Lock function protects data from being erased due to unintentional
overwriting on the fixed data in the Tags.
■ Lock setting in ISO mode
For the lock setting in ISO mode, you can write-protect any given areas by
the page of Tag memory.
If you execute Write command on a write-protect page, a write processing
error (code:79) will occur. You can make the lock setting by executing the
Lock command (LK) that enables access to the lock setting area.
For the details, see 5-4-7 “Lock Setting: ISO Mode.”
■ Lock setting in I.CODE1 mode
There is a lock setting area in the system area of I.CODE1 chip, and you
can write-protect any given areas by page.
If you execute Write command on the write-protect page, the write
processing error (code:71) will occur.
The lock setting consists of 12 bits of data in total, giving one bit to each
page. Lock setting can be made by using the Lock command (LK).
For the details, see 5-5-9 “Lock Setting: I.CODE1 Mode.”
● Lock setting area of I.CODE1 chip: “FDh page”
Lock Setting Area
1 byte 1 byte
b7 b6 b5 b4 b3 b2 b1 b0 b7 b6 b5 b4 b3 b2 b1 b0
Page 10 Page 09 Page 08 Page 07 Page 06 Page 05 Page 04 Page 03 Page 02 Page 01 Page 00 Family code, application ID QU IET EAS Write Protect SNR SNR
Note:
● The write protection cannot be canceled by the V720-series lock function. Data can never be re-written into
write-protected pages; be careful in setting write protection.
● Be extremely careful when setting write protection in the system area.
● Tag-specific codes (UID on I.CODE SLI/SNR on I.CODE1) are write-protected when manufactured.