A semiconductor integrated circuit includes: a first circuit, a second circuit, a third circuit, and a first switch circuit. The first circuit is configured to output a first signal. The second circuit is configured to output a second signal different from the first signal. The third circuit is configured to output a third signal corresponding to either the first signal or the second signal. The first switch circuit is configured to output the third signal to the first circuit in a case that the first circuit outputs the first signal. The first switch circuit is configured to output the third signal to the second circuit in a case that the second circuit outputs the second signal.