Interface control circuit and control method thereof

A control method for controlling an interface control circuit, wherein the interface control circuit complies with an interface specification, and wherein the interface control circuit includes an interface signal transceiver circuit coupled to a first interface connection pin and a second interface connection pin of a first interface connector circuit, the interface connector circuit being configured to operably transmit and/or receive an interface signal according to the interface specification;

• the control method comprising:
• under a first state, controlling the interface signal transceiver circuit to generate a first pull-up signal and a first pull-down signal which are toggled with each other at the first interface connection pin;
• and
• when the interface signal transceiver circuit operates under the first state, determining whether a foreign object exists between the first interface connection pin and the second interface connection pin according to a voltage change or a current change between a first time point and a second time point at the second interface connection pin;
• wherein the first time point and the second time point correspond respectively to a time point before and a time point after the first pull-up signal is toggle to the first pull-down signal or the first pull-down signal is toggled to the first pull-up signal;
• or the first time point and the second time point correspond respectively to two consecutive time points after the first pull-up signal is toggle to the first pull-down signal or the first pull-down signal is toggled to the first pull-up signal.