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grawley

USA
1 Posts
Posted - 02/28/2007 :  18:15:12  Show Profile
I can read a PC file into the buffer. I can erase the chip. I can write the buffer to the chip, then erase the buffer and read the chip and see that the chip was written successfully.

I am trying to read a AT89C55WD with an unknown program. I can read the electronic ID. However, this chip and duplicate chips read empty. These chips operate in the circuit. How do I read the program?
Reply #1

ZLM

2945 Posts
Posted - 03/03/2007 :  13:32:24  Show Profile
It seems the chip been set the lock bit.
If that is the case, then there is no way to read it out.
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