M30222 Datasheet, PDF (220/237 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

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Specifications in this manual are tentative and subject to change
MITSUBISHI MICROCOMPUTERS
M30222 Group
Rev. G
Serial I/O Mode 1 (Flash Memory Version)
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Data Protection (Block Lock)
Each of the blocks in Figure 1.181 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 executing status of the lock bit
disable and lock 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 e
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.
Block 8 : 4 Kbytes
7D00016
7E00016
Flash
Flash memory
memory size _{start address}
260 Kbytes
7D00016
C0000₁₆
Fig. 1.181. Block in the user area
Block 7 : 64 Kbytes
Block 6 : 64 Kbytes
Block 5 : 64 Kbytes
Block 4 : 32 Kbytes
Block 3 : 24 Kbytes
Block 2: 4 K byte
Block 1: 4 K byte
User ROM area
BFFFF16
C000016
D000016
E000016
F0000 ₁₆
F8000 ₁₆
FE00016
FF00016
FFFFF ₁₆
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