Datasheet

RL78/L12 CHAPTER 26 FLASH MEMORY
R01UH0330EJ0200 Rev.2.00 824
Dec 13, 2013
Table 26-12. Relationship between Enabling Security Function and Command
(1) During serial programming
Valid Security Executed Command
Block Erase Write
Prohibition of block erase Blocks cannot be erased.
Can be performed.
Note
Prohibition of writing Blocks can be erased. Cannot be performed.
Prohibition of rewriting boot cluster 0 Boot cluster 0 cannot be erased. Boot cluster 0 cannot be written.
Note Confirm that no data has been written to the write area. Because data cannot be erased after block erase is
prohibited, do not write data if the data has not been erased.
(2) During self-programming
Valid Security Executed Command
Block Erase Write
Prohibition of block erase Blocks can be erased. Can be performed.
Prohibition of writing
Prohibition of rewriting boot cluster 0 Boot cluster 0 cannot be erased. Boot cluster 0 cannot be written.
Remark To prohibit writing and erasing during self-programming, use the flash shield window function (see 26.6.2 for
detail).
Table 26-13. Setting Security in Each Programming Mode
(1) During serial programming
Security Security Setting How to Disable Security Setting
Prohibition of block erase
Set via GUI of dedicated flash memory
programmer, etc.
Cannot be disabled after set.
Prohibition of writing
Set via GUI of dedicated flash memory
programmer, etc.
Prohibition of rewriting boot cluster 0 Cannot be disabled after set.
Caution Releasing the setting of prohibition of writing is enabled only when the security is not set as the
block erase prohibition and the boot cluster 0 rewrite prohibition with code flash memory area and
data flash memory area being blanks.
(2) During self-programming
Security Security Setting How to Disable Security Setting
Prohibition of block erase
Set by using flash self-programming
library.
Cannot be disabled after set.
Prohibition of writing
Cannot be disabled during self-
programming (set via GUI of dedicated
flash memory programmer, etc. during
serial programming).
Prohibition of rewriting boot cluster 0 Cannot be disabled after set.