Questions tagged [8051]

8051 aka MCS-51 is the 8-bit microcontroller architecture created by Intel in 1980. The original chips were discontinued in 1996 but it still remains one of the most ubiquitous embedded architectures for simple control tasks.

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Understanding operation of ALU in SAF80-C509

Good day. I'm reversing an automotive ECU firmware which works on SAF80-C509 processor (Intel 51 architecture). Now, I've got this part of code: code:64C5 mov MD0, R0 ; ...
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Is there a way to identify a specific microprocessor model?

I'm working on reversing a USB flash drive controller chip. I know there's a microprocessor that runs some 8051 variant, and I have the ability to run arbitrary code on it. There's lots of different ...
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Radare2 8051 code bank switching

Some of 8051 chips use bank switching to extend accessible code memory. Good example is Silabs C8051F12x. Another example is here. Code area in range 0x0000..0x7ffff is common always accessible code ...
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Loading 8051 binary to IDA with ROM+External RAM configuration

I have 8051 firmware file, in 8051 ROM addresses can overlap external RAM addresses(movc and movx solve this issue), however IDA doesn't allow overlapping addresses: In this example the ROM size is ...
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Reverse Engineering 8051 firmware

I am looking to reverse engineer an 8051 firmware binary file and am not certain where to start. The firmware is for the Real RTL8188EE wireless card. It is located here: https://github.com/lwfinger/...
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Disassemble CC2541 firmware (TI SensorTag)

I'm digging into a BLE product based on a CC2541 MCU (similar to the Texas Instruments SensorTag). So for experimenting we can use an official firmware: http://processors.wiki.ti.com/images/1/10/...