MSP430AFE231: Are there MSP430 or other TI processors that cannot write to their flash?

Hello John,

Sorry for that I am a little confused with your question, so you want to find a microcontroller with a fixed code in in its Flash when it is sent out from factory and no one can modify it, or you want to find a microcontroller that you can write code into Flash and after you complete development, you don't other people to modify the Flash, you want to do Flash write protection?

What kind of microcontroller you want, could you please explain it in details?

Best Regards,

Janz Bai

Hi Janz

Yes, you've stated more clearly what I want.  Flash memory write protection. 

Once the code is loaded, I would like to protect the flash from being modified by the program.  Some Microchip parts have a configuration bit that can be set that prevents any modification to the flash until a bulk erase is performed.  That's the sort of thing I need for this application.

Otherwise, the AFE 231 would be ideal.  High resolution ADC, spi/I2C, etc.

Thanks!

John

You can lock JTAG (and password protect BSL) but the code on the device is always going to be able to write to flash. Since you control that code, this wouldn't seem to be a problem.

Writing to flash isn't the sort of thing that will happen by accident.

Quite true.  I am pursuing this line of logic for now.

Hello John,

Maybe you can try to learn about M0 device. it have write protection feature by setting registers in NONMAIN. By writing protection, it will protect the Flash and don't let any one write code into it after you complete the code development.

Best Regards,

Janz Bai