Reverse Engineering Microcomputer ATmega2560 internal memory, and extract MCU ATmega2560 Program out from flash memory, crack Microcontroller ATmega2560 security fuse bit by focus ion beam technique;

Reverse Engineering Microcomputer ATmega2560 internal memory, and extract MCU ATmega2560 Program out from flash memory, crack Microcontroller ATmega2560 security fuse bit by focus ion beam technique

If lock bits LB1 and LB2 have not been programmed, the programmed Code can be read back via the address and data lines for verification. The state of the lock bits can also be verified directly in the parallel programming mode when copying infineon saf-xc888cm-8ffi binary.

In the serial programming mode, the state of the lock bits can only be verified indirectly by observing that the lock bit features are enabled. In the parallel programming mode, Microcomputer erase is initiated by using the proper combination of control signals and by holding ALE/PROG low for 10 ms.
The Code array is written with all “1”s in the Microcomputer Erase operation. In the serial programming mode, a Microcomputer erase operation is initiated by issuing the Microcomputer Erase instruction. In this mode, Microcomputer erase is self-timed and takes about 16 ms.
During Microcomputer erase, a serial read from any address location will return 00H at the data outputs. A programmable fuse is available to disable Serial Programming if the user needs maximum system security after recover Microcomputer C8051F340 firmware.
The Serial Programming Fuse can only be programmed or erased in the Parallel Programming Mode. The AT89S53 is shipped with the Serial Programming Mode enabled.

Reading the Signature Bytes: The signature bytes are read by the same procedure as a normal verification of locations 030H and 031H, except that P3.6 and P3.7 must be pulled to a logic low. The values returned are as follows:
(030H) = 1EH indicates manufactured by Atmel
(031H) = 53H indicates 89S53
Every code byte in the program array can be written, and the entire array can be erased, by using the appropriate combination of control signals. The write operation cycle is self-timed and once initiated, will automatically time itself to completion.
All major programming vendors offer worldwide support for the Atmel microcontroller series. Please contact your local programming vendor for the appropriate software revision.

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