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RL78/G1A CHAPTER 25 FLASH MEMORY
Table 25-12. Relationship Between Enabling Security Function and Command
(1) During serial programming
Executed Command Valid Security
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
Executed Command Valid Security
Block Erase Write
Prohibition of block erase
Prohibition of writing
Blocks can be erased. Can be performed.
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 25.6.3 for
detail).
Table 25-13. Setting Security in Each Programming Mode
(1) During serial programming
Security Security Setting How to Disable Security Setting
Prohibition of block erase Cannot be disabled after set.
Prohibition of writing
Set via GUI of dedicated flash memory
programmer, etc.
Prohibition of rewriting boot cluster 0
Set via GUI of dedicated flash memory
programmer, etc.
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.
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(2) During self-programming
Security Security Setting How to Disable Security Setting
Prohibition of block erase 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
Set by using flash self-programming
library.
Cannot be disabled after set.
R01UH0305EJ0200 Rev.2.00 821
Jul 04, 2013