M16C6NK Datasheet, PDF (295/404 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/60 SERIES

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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 programming.
Start
Write the command code "xx71h"
Write "xxD0h" to the highest-order
block address
NO
FMR00=1?
YES
NO
FMR16=0?
YES
Block is locked
Block is not locked
NOTE:
1.Write the command code and data to even addresses.
Figure 21.11 Read Lock Bit Status Command
Rev.2.00 Nov 28, 2005 page 277 of 378
REJ09B0124-0200