
Rev.2.10 Apr 14, 2006 page 277 of 378
REJ09B0124-0210
M16C/6N Group (M16C/6NK, M16C/6NM) 21. Flash Memory Version
21.3.5.8 Read Lock Bit Status Command (71h)
The read lock bit status command reads the lock bit state of a specified block.
By writing xx71h in the first bus cycle and xxD0h to the highest-order even address of a block in the
second bus cycle, the FMR16 bit in the FMR1 register stores information on whether or not the lock bit
of a specified block is locked. Read the FMR16 bit after the FMR00 bit in the FMR0 register is set to 1
(ready).
Figure 21.11 shows a flow chart of the Read Lock Bit Status Command.
Start
YES
NO
FMR00=1?
YES
NO
FMR16=0?
Write the command code xx71h
Write xxD0h to the highest-order
block address
Block is not locked
Block is locked
NOTE:
1.Write the command code and data to even addresses.
Figure 21.11 Read Lock Bit Status Command
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