M16C30P_07 Datasheet, PDF (232/317 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/30 SERIES

M16C/30P Group
19. Flash Memory Version
19.3.5.7 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 19.12 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
NOTES:
1. Write the command code and data to even addresses.
Figure 19.12 Read Lock Bit Status Command
Rev.1.22 Mar 29, 2007 Page 216 of 291
REJ09B0179-0122