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Security Function
The flash microcontrollers of NEC Electronics come with reliable and easily settable security functions. Through security settings, the valuable program assets of customers are protected from third parties and data destruction through malfunction is prevented.
- Write prohibit setting: Prohibits write to the entire flash memory area.
- Chip erase prohibit setting: Prohibits erasure in the entire flash memory area.
- Block erase prohibit setting: Prohibits block erasure of flash memory.
- Boot block rewrite prohibit setting: Prohibits erasure and rewrite of the boot block.
- Read prohibit setting: Prohibits read of the entire memory area (only for products that support the read command).
- Security-level customization can be done through combinations of security flags.
- The boot program is securely protected through the boot block rewrite prohibit setting even if the microcontroller runs away.
- Security equivalent to that of conventional ROM products is realized by performing the write prohibit and chip erase prohibit (read prohibit) settings.
In addition, the following settings can also be performed when performing the security function settings.
- Boot block cluster change setting, which changes the boot block size for which rewrite is prohibited.
- Reset vector handler address change setting, which changes the reset vector handler address to any desired address.
Remark
- The supported security functions differ for each device series. For details, please contact our Local NEC Electronics representative.
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