m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 421

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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25.3.3 Data Protect Function
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Each block in the flash memory has a nonvolatile lock bit. The lock bit is enabled by setting the FMR02 bit
to "0" (lock bit enabled). The lock bit individually protects (locks) each block against program and erase.
This prevents data from being inadvertently written to or erased from the flash memory.
The lock bit status is set to "0" (locked) by executing the lock bit program command and to "1" (unlocked)
by erasing the block. The lock bit status cannot be set to "1" by any commands.
The lock bit status can be read by the read lock bit status command.
The lock bit function is disabled by setting the FMR02 bit to "1". All blocks are unlocked. However,
individual lock bit status remains unchanged. The lock bit function is enabled by setting the FMR02 bit to
"0". Lock bit status is retained.
If the block erase or erase all unlocked block command is executed while the FMR02 bit is set to "1", the
target block or all blocks are erased regardless of lock bit status. The lock bit status of each block is set to
"1" after an erase operation has been completed.
Refer to 25.3.5 Software Commands for details on each command.
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• When the lock bit status is set to "0", the block is locked (block is protected against program and erase).
• When the lock bit status is set to "1", the block is not locked (block can be programmed or erased).
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25. Flash Memory Version