Logic circuit, processing unit, electronic component, and electronic device

A logic circuit comprising a first circuit and a second circuit,

• wherein the first circuit includes first to n-th input terminals and a first output terminal, where n is an integer of 2 or more,
• wherein the second circuit includes an (n+1)th input terminal, a first node, a first capacitor, and first to third transistors,
• wherein the first circuit is configured to select one of the first to n-th input terminals and to output data whose logic level is the same as a logic level of the selected input terminal from the first output terminal,
• wherein the first capacitor is electrically connected to the first node,
• wherein the first transistor is configured to control electrical connection between the (n+1)th input terminal and the first input terminal,
• wherein the second transistor is configured to control electrical connection between the first output terminal and the first node,
• wherein the third transistor is configured to control electrical connection between the first node and the first input terminal,
• wherein a gate of the first transistor is electrically connected to a gate of the second transistor, and
• wherein the second transistor and the third transistor each include a semiconductor region comprising an oxide semiconductor layer.