MCU?

[songjunbiao]

MCU does not show the model number inside how do you analyze which model of MCU it is?

[amnemonic]

I don't remember exactly in which way this info was obtained particularly for this radio but in general i think these are good methods:

• pin count, cpu clock etc can be compared against known MCUs datasheets
• searching for strings in firmware
• hint is always AP-IDR value which in case of our CPU is 0x04770021 (if you know DAP/SWD/JTAG pinout)
• looking what MCU vendor was used in previous products of given company
• if you have firmware then you can look at startup code and search for some magic values of registers on GitHub for example