Unlock MC68HC705C8A MCU Flash Memory

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Unlock MC68HC705C8A MCU Flash Memory

To further disable monitor mode functions to Unlock MC68HC705C8A MCU Flash Memory, locations $FFC0–$FFC7. The keyword is eight bytes long with a 7-byte ASCII string and 1-byte $00 delimiter. The keyword for the MC68HC705C8A MCU is “PSWDOPT” + $00.

Unlock MC68HC705C8A MCU Flash Memory

Unlock MC68HC705C8A MCU Flash Memory

Entry to monitor mode with extended security command keyword programmed, the MCU stops communicating with the host after transmitting a break character if the host fails the security bypass as described in 10.5 Security.

Once the extended security command keyword is programmed, the FLASH memory cannot be erased without a valid security code (matching $FFF6–$FFFD). Therefore, the extended security command keyword should not be programmed during software development.

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