RL78/F13, F14 CHAPTER 30 FLASH MEMORY
R01UH0368EJ0210 Rev.2.10 1643
Dec 10, 2015
30.7 Security Settings
The RL78/F13 and RL78/F14 support security functions that prohibit rewriting the user program written to the internal
flash memory, so that the program cannot be changed by an unauthorized person.
The operations shown below can be performed using the Security Set command.
ï‚· Disabling block erase
Execution of the block erase command for a specific block in the flash memory is prohibited during serial programming.
However, blocks can be erased by means of self programming.
ï‚· Disabling write
Execution of the write command for entire blocks in the code flash memory is prohibited during serial programming.
However, blocks can be written by means of self programming.
After the setting of prohibition of writing is specified, releasing the setting by the Security Release command is
enabled by a reset.
ï‚· Disabling rewriting boot cluster 0
Execution of the block erase command and write command on boot cluster 0 (00000H to 1FFFH) in the code flash
memory is prohibited by this setting.
The block erase, write commands, and rewriting boot cluster 0 are enabled by the default setting when the flash memory
is shipped. Security can be set by serial programming and self programming. Each security setting can be used in
combination.
Table 30-12 shows the relationship between the erase and write commands when the RL78/F13 or RL78/F14 security
function is enabled.
Caution The security functions of the dedicated flash programmer does not support self-programming.
Remark To prohibit writing and erasing during self-programming, use the flash shield window function (see 30.6.3 Flash
shield window function for detail).
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