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Rap0ns
Spain
4 Posts |
 Posted - 12/17/2015 : 06:56:09
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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. |
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| Reply #1
anniel
2572 Posts |
Posted - 12/17/2015 : 07:32:18
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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
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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
2572 Posts |
Posted - 12/17/2015 : 08:04:21
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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
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| 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
2572 Posts |
Posted - 12/17/2015 : 08:47:43
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| Do you have a reference that shows it can be locked by a programmer? |
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| Reply #6
anniel
2572 Posts |
Posted - 12/17/2015 : 09:26:40
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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
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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
2572 Posts |
Posted - 12/17/2015 : 13:07:32
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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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Topic |
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24C04WP
Forum Locked
