tmp89fm42 TOSHIBA Semiconductor CORPORATION, tmp89fm42 Datasheet - Page 373

• Manufacturer Part Number: tmp89fm42
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA002
22.12.2Security program
22.12.2.1How the security program functions
22.12.2.2Enabling or disabling the security program
for protection, and a special command is required to make this protection setting. If the security program is
enabled, the reading or writing of flash memory in parallel PROM mode is prohibited. In serial PROM mode,
the read and write of flash memory and other operation commands cannot be used. In performing OCD, two
options about system startup are provided: prohibiting the system startup by using an option code and starting
the system by password authentication.
The security program can be used in parallel and serial PROM modes and for OCD. It has a special memory
tion to a specially-designed memory. Because protection-related information is written to this specially-
designed memory, no user memory resource are required.
With the TMP89FM42, you can control the read of flash memory by writing protection-related informa-
• Enabling the security program
• Disabling the security program
To enable the security program, execute the flash memory security setting command.
To disable the security program, execute Chip Erase of the flash memory erase command.
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