MCUmall EPROM BIOS Chip Burner Forum
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Rap0ns

Spain
4 Posts

Posted - 12/17/2015 :  06:56:09  Show Profile  Reply with Quote
Hi guys, im trying reprogram this eep, but i cannt use Lock option to activate Write protect.

Someone can tell me how can i activate Write protect on this chip?.

I have only 24c04 eep, i cannt find 24c04wp on device list.

Regards.
Reply #1

anniel

2531 Posts

Posted - 12/17/2015 :  07:32:18  Show Profile  Reply with Quote
Do you have the datasheet?
The Lock option is greyed out?

Edited by - anniel on 12/17/2015 07:40:26
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Reply #2

Rap0ns

Spain
4 Posts

Posted - 12/17/2015 :  07:53:18  Show Profile  Reply with Quote
if i write with lock option checked, i can write the eep, but dont work because i can write another time the eep.
But if i press CTRL + L, program send me a window with Not Supported. i think the problem is the device because i cannt find 24c04WP on device, only 24c04 ST24c04.... All without WP.
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Reply #3

anniel

2531 Posts

Posted - 12/17/2015 :  08:04:21  Show Profile  Reply with Quote
Do you have the datasheet?
Are you certain the chip supports that function?
Usually WP on 24 series EEPROM is performed by pin 7 on DIP or SOIC.
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Reply #4

Rap0ns

Spain
4 Posts

Posted - 12/17/2015 :  08:29:48  Show Profile  Reply with Quote
i can not find datasheep for specific 24c04WP but have the same to 24c04, the difference is: This chip can be locked by programmer. Maybe the chip can get lock function writing as normal?. You can use google to find big amount of this kind of chip. I am inventing nothing.
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Reply #5

anniel

2531 Posts

Posted - 12/17/2015 :  08:47:43  Show Profile  Reply with Quote
Do you have a reference that shows it can be locked by a programmer?
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Reply #6

anniel

2531 Posts

Posted - 12/17/2015 :  09:26:40  Show Profile  Reply with Quote
Taken from the datasheet of a SIMILAR device;

"The sequence to use the Write Protected feature
is:
– write the data to be protected into the top of the
memory, up to, but not including, location 1FFh;
– set the protection by writing the correct bottom
boundary address in the Address Pointer (5
MSBs of location 1FFh) with bit b2 (Protect flag)
set to ’0’. Note that for a correct fonctionality of
the memory, all the 3 LSBs of the Block Address
Pointer must also be programmed at ’0’."

Without the proper datasheet its only speculation.

Edited by - anniel on 12/17/2015 09:27:41
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Reply #7

Rap0ns

Spain
4 Posts

Posted - 12/17/2015 :  10:47:37  Show Profile  Reply with Quote
Ok so i will have to put it manually. Or at least try it. Thx mate.

Can you tell me where is the 1FFh location?.

Regards
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Reply #8

anniel

2531 Posts

Posted - 12/17/2015 :  13:07:32  Show Profile  Reply with Quote
I found this.

h**p://lh6.ggpht.com/_H-OQr197CAc/Srb6KVOSXqI/AAAAAAAAAQI/PHdm0KrTaQA/clip_image041_thumb.gif?imgmax=800

Edited by - anniel on 12/17/2015 17:03:07
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