SATO CL4NX Programming Reference Manual page 393

Parameters related to locking user block and subtraction register (omissible)
lck: User block lock
Parameters related to system block lock (omissible)
System block lock
lsy:
Set a fixed 15-digit binary.
The bitmap image corresponds to the 14 scratch pad blocks (00H～0DH)
and 1 subtraction block (0EH), and the block sequence is 00H～0EH from
the left.
･･････････
0 1
If this parameter is specified, the block specified to 1 can be locked
(read-only). Specified the block not to be locked to 0.
Note that once you lock the blocks, the locked blocks become read-only
and you cannot unlock them.
Set a fixed 2-digit binary.
0 1
System blocks (block number: 82H, 83H, 84H, 86H,
87H) and MC blocks (MC[2]～MC[5]) lock
※For FeliCa Lite, the lock range of MC block is MC[2]
～MC[4].
MC blocks (MC[0]～MC[1], MC[6]～MC[12]) lock
※For FeliCa Lite, the lock range of MC block is MC[0]
～MC[1].
If this parameter is specified, the system block specified to 1 can be
locked. Specified the block not to be locked to 0.
Note that once you lock the blocks, the locked blocks become read-only
and you cannot unlock them.
385
D E
Subtraction block (1 digit)
Scratch pad block (14 digits)