Expanded microcomputer system for controlling radio frequency interference.

The radio receiver (40) for receiving RF signals comprises receiving circuitry (42) for receiving and demodulating the RF signal and a microcomputer (44) coupled to the receiving circuitry (42) for releasing and blocking of receiving circuits (42) at predetermined times. The radio receiver (40) further comprises an expansion chip (68) connected to the microcomputer (44), which is controlled for communication, in order to further process the RF signal. Communication between the microcomputer (44) and the expansion integrated circuit (68) extends a first speed when the receiving circuitry (42) are released and the second speed, higher than the first speed when the receiving circuitry (42) blocked. à