S12 / MagniV Microcontrollers中的主题回复： Unsecure ms9s12p128

Unsecure ms9s12p128

MUXU — Fri, 28 Nov 2025 06:42:09 GMT

I have set the backdoor access key for mc9sp128 and configured the security state.

Now I want to read the flash content. How can I unlock it?

danielmartynek — Fri, 28 Nov 2025 09:04:51 GMT

Once the MCU is unlocked via the backdoor key, you need to attach the debugger without resetting the MCU, any reset would lock the MCU again.

Regards,

Daniel

MUXU — Sat, 29 Nov 2025 07:51:06 GMT

First of all,thank you for your help.

I saw that there is a example in AN2880.pdf,but I couldn't find the AN2880SW.zip file.

Could you please assist me with this?

MUXU — Mon, 01 Dec 2025 06:16:57 GMT

void Verity_BackdoorKey（void）

｛

while（（FSTAT&0X80) == 0){
if(FSEC&0X03)!=0X02 && (FSEC&0XC0) == 0X80) {

FSTAT=0X30;

FCC0BIX=0X00;FCCOB=0X0C00;

FCC0BIX=0X01;FCCOB=0X1234;

FCC0BIX=0X02;FCCOB=0X4567;

FCC0BIX=0X03;FCCOB=0X89AB;

FCC0BIX=0X04;FCCOB=0XCDEF;

Disable_Interrupt();

FlashOperateRun;

Enable_Interrupt();

}