when even your "embedded firmware user guide" refers to it as an "embedded microcontroller" there's gotta be something deeper going on herepic.twitter.com/IfBavDHwyx
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when even your "embedded firmware user guide" refers to it as an "embedded microcontroller" there's gotta be something deeper going on herepic.twitter.com/IfBavDHwyx
copious web searching, found a firmware blob. will be shocked if they used a different micro in these other cameras. time to work out for sure if it's inevitably an 8051pic.twitter.com/aI90JMrhTx
cool, looks like an 8051. spoken with caution - since **all but one** 8-bit value is a valid 8051 opcode (i.e. you can disassemble random bytes, it'll look like "code" but won't look like /actual/ code) but this looks "real", some initialisation maybe. yay!pic.twitter.com/nA7Kor3CAg
to drag on that point about random bytes a bit, i took 256 bytes from /dev/urandom and disassembled them as 8051. there's "code"! it's got jumps! calls!
if you aren't paying attention, you can so easily be tricked into thinking it's just complex code you don't yet understand
pic.twitter.com/JCDpqiHoWZ
hooray! reversed a function that does some kind of initialisation of particular values in XMEM from a table. each entry is an XMEM address, and an AND/OR mask to apply to the value at the address.pic.twitter.com/AluicDZ976
"advanced 8-bit microprocessor" because it doesn't take 12 cycles per instruction like intel's original one
Who needs to ever mention the 8051 when you can fill 80% of the datasheet with the complete 8051 register, the instruction set with timings and address bus waveforms.
"...is a high performance 8051 compatible micro-controller, regard to its build-in Pipe-line instruction fetch structure, that helps the (chip) can perform more fast operation speed and higher calculation performance, if compare SH79F166A with standard 8051 at same clock speed"pic.twitter.com/NvHgW98LJR
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