Now you have a complete answer to the question, It is a sophisticated dance between the Android user interface, the MCU firmware, and the silicon tuner chip. The app sends simple commands; the MCU does the heavy lifting of frequency synthesis, RDS decoding, and audio switching.
: Many enthusiasts now use USB-stick adapters to add digital radio support, which the community-developed apps handle far better than the original software. Key Solutions for MTCD Users mtcd radio app work