unable to flash MC9S12XE

[lin_karl]

Hello, 

I am using microcontroller MC9S12XET256MAL and I am using Code Warrior as development code and PE Micro USB multilink interface as flashing tool. originally I have no problem flashing the program into uC. however, yesterday when I flash again, I got the error message says, "Communicatoin with the target failed: the target MCU has no clock or wrong BDM clock speed is used or derivative is secure."

        at first, I fixed the problem by going into MCU properties > Internal Peripherals > FLASH > security state and set it to disable. I was able to flash one more time before it display the above error message again.   

      does anyone know what cause it and how do I fix it?

Thanks, 

Karl 

[kef · Accepted solution]

MCU properties > Internal Peripherals > FLASH > security state  is probably Processor Expert setting? It won't help unsecuring secured device. I thing this setting allows to change NVSEC bits in linker produced ELF and S-records files.

Try downloading and unsecuring with Unsecure_12 tool from www.pemicro.com