1. A system adapted to be connected to a plurality of electrodes coupled to a heart, the system comprising: a sensing circuit configured to sense a cardiac signal indicative of cardiac events; an electrode interface circuit configured to programmably connect the sensing circuit to a set of sensing electrodes selected from the plurality of electrodes according to a sensing configuration specifying the set of sensing electrodes; and a control circuit coupled to the electrode interface circuit, the control circuit including: an electrode configuration controller configured to set the sensing configuration to a first sensing configuration during a first sensing period and set a second sensing configuration during a second sensing period; an event detector configured to detect first events of the cardiac events using the cardiac signal sensed during the first sensing period and detect second events of the cardiac events using the cardiac signal sensed during the second sensing period; and an event recognition module configured to recognize one or more events of the first events each by origin using one or more events of the second events.