M16CSLASH62 datasheet(281/621 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Appendix Standard Serial I/O Mode (Flash Memory Version)

266

Data Protection (Block Lock)

Each of the blocks in Figure 1.30.1 have a nonvolatile lock bit that specifies protection (block lock) against

erasing/writing. A block is locked (writing “0” for the lock bit) with the lock bit program command. Also, the

lock bit of any block can be read with the read lock bit status command.

Block lock disable/enable is determined by the status of the lock bit itself and execution status of the lock

bit disable and lock enable bit commands.

(1) After the reset has been cancelled and the lock bit enable command executed, the specified block

can be locked/unlocked using the lock bit (lock bit data). Blocks with a “0” lock bit data are locked

and cannot be erased or written in. On the other hand, blocks with a “1” lock bit data are unlocked

and can be erased or written in.

(2) After the lock bit enable command has been executed, all blocks are unlocked regardless of lock bit

data status and can be erased or written in. In this case, lock bit data that was “0” before the block

was erased is set to “1” (unlocked) after erasing, therefore the block is actually unlocked with the

lock bit.

0C000016

0D000016

Block 6 : 64K byte

Block 5 : 64K byte

0E000016

Block 4 : 64K byte

0F000016

Block 3 : 32K byte

0F800016

Block 2 : 8K byte

0FA00016

Block 1 : 8K byte

Block 0 : 16K byte

0FC00016

User ROM area

0FFFFF16

Flash memory

size

Flash memory

start address

256K byte

0C000016

Figure 1.31.18. Blocks in the user area

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