| 摘要 |
Signal processing units capable of providing plug-in detection without an external circuit occupying GPIO resource are provided, in which a switching element is coupled to a television signal output pad, a terminal resistor is coupled between the switching element and a ground voltage, and an interrupt signal generator generates an interrupt signal when a receiving port of a television signal receiver is coupled to the television signal pad. A control unit turns on the switching element to connect the terminal resistor to the television signal output pad when receiving the interrupt signal, wherein the switching element, the terminal resistor, the interrupt signal generator and the control unit are integrated in a chip.
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