General > General Technical Chat
Car alarm siren issue
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slybunda:
removed the sticker of the small chip and its got some markings on it:

12C508A
04/P01V
0113

maybe if i can find a datasheet for this it may give schematic info of whats supposed to be connected to it and how?
tom66:
That's a PIC12C508A microcontroller.  It's not going to be replaceable because it will have firmware embedded into it.  If you suspect it is fried, the whole device is scrap, unfortunately.
coromonadalix:

--- Quote from: tom66 on February 08, 2024, 03:43:16 pm ---That's a PIC12C508A microcontroller.  It's not going to be replaceable because it will have firmware embedded into it.  If you suspect it is fried, the whole device is scrap, unfortunately.

--- End quote ---

unless  by some miracle they forgot to lock the mcu from being read ...     no luck to recover the firmware
tom66:

--- Quote from: coromonadalix on February 08, 2024, 04:02:01 pm ---
--- Quote from: tom66 on February 08, 2024, 03:43:16 pm ---That's a PIC12C508A microcontroller.  It's not going to be replaceable because it will have firmware embedded into it.  If you suspect it is fried, the whole device is scrap, unfortunately.

--- End quote ---

unless  by some miracle they forgot to lock the mcu from being read ...     no luck to recover the firmware

--- End quote ---

Yes, if they forgot to lock it, but even if it is unlocked if the MCU has been killed by something failing in the circuit board, it is unlikely to be able to connect to the programmer anyway.
slybunda:
what can i use to try and read the code from the chip? would it work with an arduino uno or one of those ch340 things?
also i dont think it is dead because the siren still worked as in if i hold the panic button on the key fob the alarm goes off making its usual sounds.
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