Abstract: To reduce the time of reception operation switching between multiple wireless systems, a semiconductor integrated circuit includes a first reception unit including a first analog reception unit and a first digital reception unit, and a digital interface. The first analog reception unit includes a first reception mixer and a first A/D converter, and the first digital reception unit includes a first digital filter. The first reception unit, an oscillator, and a PLL enable switching from a reception operation for a first RF reception signal of a first system to a reception operation for a second RF reception signal of a second system. In a period of an end transition operation of the first digital reception unit in the switching, the PLL starts a lock operation so as to match a frequency of an oscillation output signal generated from the oscillator to a desired frequency of the second system.