topic Re: erasing the page FF and page FD ? in S12 / MagniV Microcontrollers

erasing the page FF and page FD ?

qinxk — Sat, 19 Sep 2020 03:49:10 GMT

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.

Re: erasing the page FF and page FD ?

danielmartynek — Tue, 22 Sep 2020 10:49:14 GMT

Hello,

Which MCU do you use?

Thanks,

BR, Daniel

Re: erasing the page FF and page FD ?

qinxk — Tue, 22 Sep 2020 13:10:00 GMT

Hi, MCU is MC9S12XDG128MAL

Re: erasing the page FF and page FD ?

danielmartynek — Wed, 23 Sep 2020 08:47:08 GMT

Hi,

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

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

Thank you,

BR, Daniel

Re: erasing the page FF and page FD ?

qinxk — Wed, 23 Sep 2020 09:02:11 GMT

Thanks! Your answer is very helpful for me.

Unsecure is failure as follow:

Using default configuration: (Bus clk maybe 40MHz)

Re: erasing the page FF and page FD ?

danielmartynek — Wed, 23 Sep 2020 11:05:57 GMT

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

Re: erasing the page FF and page FD ?

qinxk — Thu, 24 Sep 2020 01:31:39 GMT

ECLKDIV/FCLKDIV = 0x28

OSCCLK = 8MHz

Re: erasing the page FF and page FD ?

danielmartynek — Thu, 24 Sep 2020 07:41:19 GMT

Hi,

Have you tried with CLKDIV = 0x28 = 40?

BR, Daniel

Re: erasing the page FF and page FD ?

qinxk — Sat, 26 Sep 2020 00:59:02 GMT

Yes！

Re: erasing the page FF and page FD ?

qinxk — Sat, 26 Sep 2020 00:59:52 GMT

Hi， yes

It is still failure!

Re: erasing the page FF and page FD ?

danielmartynek — Tue, 29 Sep 2020 09:35:11 GMT

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

Re: erasing the page FF and page FD ?

kef2 — Mon, 04 Jan 2021 13:09:20 GMT

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"