M16C Datasheet, PDF (256/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Preliminary Specifications REV.B
Specifications in this manual are tentative and subject to change.
Mitsubishi microcomputers
M16C / 6N Group
Standard Serial I/O Mode
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Data Protection (Block Lock)
Each of the blocks in Figure 24-1 has 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 is cancelled and the lock bit enable command executed, the specified block can be
locked/unlocked using the lock bit (lock bit data). Blocks with "0" lock bit data are locked and cannot
be erased or written in. On the other hand, blocks with "1" lock bit data are unlocked and can be
erased or written in.
(2) After the lock bit enable command is executed, all the blocks are unlocked regardless of lock bit data
status and can be erased or written in. In this case, lock bit data that were "0" before the block was
erased will be set to "1" (unlocked) after erasing, therefore the block is actually unlocked with the
lock bit.
0C000016
Block 6 : 64K byte
0D000016
Block 5 : 64K byte
0E000016
Block 4 : 64K byte
Type No.
M306N0FGTFP
Flash memory
start address
0C000016
0F000016
Block 3 : 32K byte
0F800016
0FA00016
0FC00016
0FFFFF16
Block 2 : 8K byte
Block 1 : 8K byte
Block 0 : 16K byte
User ROM area
Figure 25-17. Blocks in the user area
256