M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 265

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Appendix Standard Serial I/O Mode (Flash Memory Version)
Figure 1.31.18. Blocks in the user area
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
(2) After the lock bit enable command has been executed, all blocks are unlocked regardless of lock bit
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.
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.
Flash memory
256K byte
size
Flash memory
start address
0C0000
16
0C0000
0E0000
0F0000
0FA000
0FC000
0D0000
0FFFFF
0F8000
16
16
16
16
16
16
16
16
Block 6 : 64K byte
Block 5 : 64K byte
Block 4 : 64K byte
Block 3 : 32K byte
Block 2 : 8K byte
Block 1 : 8K byte
Block 0 : 16K byte
User ROM area
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Mitsubishi microcomputers
M16C / 62 Group
265