How to Unbrick AT89s8253 Lock Byte Lb1 Lb2 LB3

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rickyy

Joined Feb 19, 2025
1
hello, I'm not a programmer and I want to ask.
I accidentally made a mistake, I caused 1 pcs ic at89s8253 to accidentally lock lb1 lb2 lb3.
then I got a reference to buy Xgecu T48 (quite expensive) to be able to unlock, can Xgecu remove the lock on the at89s8253?
so that the program in the at89s8253 can look like before
thank you
 

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sagor

Joined Mar 10, 2019
1,046
The only way to clear the lock bits is to do a chip erase. Then, you can re-program the chip with original (or new) code.
 

BobaMosfet

Joined Jul 1, 2009
2,211
hello, I'm not a programmer and I want to ask.
I accidentally made a mistake, I caused 1 pcs ic at89s8253 to accidentally lock lb1 lb2 lb3.
then I got a reference to buy Xgecu T48 (quite expensive) to be able to unlock, can Xgecu remove the lock on the at89s8253?
so that the program in the at89s8253 can look like before
thank you
Look to see if you can connect via a JTAG device. These are usually used to unbrick or erase chips because they can use high-enough voltage to change the bits. You're going to have to get a little more knowledgeable if you're going to be serious about getting into embedded :) IMHO
 
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