erasing the page FF and page FD ?

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erasing the page FF and page FD ?

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qinxk
Contributor I

Dear:

After erasing the page FF and page FD

when I launch the debug, the following error happen:

Communication with the target failed:  The target MCU has no clock or wrong BDM clock speed is used or derivative is secured.

 

 

 

 

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

Page FF covers global 0x7F_C000 – 0x7F_FFFF address range that includes the Flash configuration filed and the Flash Security byte.

danielmartynek_1-1600850777524.png

I assume the MCU is secure, please try the Unsecure command.

danielmartynek_2-1600850785676.png

Thank you,

BR, Daniel

 

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kef2
Senior Contributor IV

Obviously your project is for other than S12XE derivative or you crafted it to use wrong *unsecure*.cmd file. Here's exceprt form unsecure cmd for S12XE. See different divider settings, no ECLKDIV at all.

Edward

 

// ver 0.2 (28-Mar-06)
// HCS12XE Core erasing + unsecuring command file:
// These commands mass erase the chip then program the security byte to 0xFE (unsecured state).

DEFINEVALUEDLG "Information required to unsecure the device" "FCLKDIV" 17 "To unsecure the device, the command script needs \nthe correct value for the FCLKDIV onchip register.\n\nDatasheet proposed values:\n\noscillator frequency\tFCLKDIV value (decimal)\n\n 16 \tMHz\t\t17\n 12 \tMHz\t\t13\n 8 \tMHz\t\t9\n 4 \tMHz\t\t5\n"

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qinxk
Contributor I

Thanks! Your answer is very helpful for me.

Unsecure is failure as follow:

image.png

Using default configuration: (Bus clk maybe 40MHz)

image.png

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

Can you take a look at the project and read what was written to the ECLKDIV / FCLKDIV registers?

What is the frequency of the oscillator?

 

Thanks,

BR, Daniel

 

 

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qinxk
Contributor I

ECLKDIV/FCLKDIV = 0x28

OSCCLK = 8MHz

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qinxk
Contributor I

Yes!

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

Have you tried with CLKDIV = 0x28 = 40?

 

BR, Daniel

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qinxk
Contributor I

Hi, yes

It is still failure!

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danielmartynek
NXP TechSupport
NXP TechSupport

Hi,

If you use a PE Micro debugger or OSBDM, please use the Unsecure12 PE Micro tool:

http://www.pemicro.com/downloads/download_file.cfm?download_id=16

 

It should unlock the MCU.

 

Thank you,

BR, Daniel

 

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danielmartynek
NXP TechSupport
NXP TechSupport

Hello,

Which MCU do you use?

 

Thanks,

BR, Daniel

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qinxk
Contributor I
Hi, MCU is MC9S12XDG128MAL
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