how to unsecure eeprom?

Started by Sim IPS October 14, 2008
Hi,
while reading the eeprom memory location 0x0FFD& eeprom register EPROT giving a value 0x20.i.e.,eeprom in secure mode .How to unsecure it?

( I am using eeprom memory is from 0x0000 to 0x0fff in mc9s12dj256b )

thanks in advance
Simi
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It's a write-protected EEPROM, not chip security when no one is allowed to
read flash and EEPROM via BDM.

If chip is not secured, then you should use BDM debugger. In special single
chip mode (only possible using BDM) EPROT and FPROT can be set from
protected to unprotected state, then you could reprogram byte at 0xFFD etc.

Edward

----- Original Message -----
From: "Sim IPS"
To: <6...>
Sent: Tuesday, October 14, 2008 07:20
Subject: [68HC12] how to unsecure eeprom?
> Hi,
> while reading the eeprom memory location 0x0FFD& eeprom register EPROT
> giving a value 0x20.i.e.,eeprom in secure mode .How to unsecure it?
>
> ( I am using eeprom memory is from 0x0000 to 0x0fff in mc9s12dj256b )
>
> thanks in advance
> Simi
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> _
>
> Scanning of this message and addition of this footer is performed
> by E-mail Content Filter Software at ADA in conjunction with McAfee
> Virus detection software
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> -
>
>
Thanks Edward

----- Original Message -----
From: Edward Karpicz
To: 6...
Sent: Tuesday, October 14, 2008 11:38 AM
Subject: Re: [68HC12] how to unsecure eeprom?
It's a write-protected EEPROM, not chip security when no one is allowed to
read flash and EEPROM via BDM.

If chip is not secured, then you should use BDM debugger. In special single
chip mode (only possible using BDM) EPROT and FPROT can be set from
protected to unprotected state, then you could reprogram byte at 0xFFD etc.

Edward

----- Original Message -----
From: "Sim IPS"
To: <6...>
Sent: Tuesday, October 14, 2008 07:20
Subject: [68HC12] how to unsecure eeprom?

> Hi,
> while reading the eeprom memory location 0x0FFD& eeprom register EPROT
> giving a value 0x20.i.e.,eeprom in secure mode .How to unsecure it?
>
> ( I am using eeprom memory is from 0x0000 to 0x0fff in mc9s12dj256b )
>
> thanks in advance
> Simi
> _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
> _
>
> Scanning of this message and addition of this footer is performed
> by E-mail Content Filter Software at ADA in conjunction with McAfee
> Virus detection software
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> -
>
>
>
>
>
>
>
>