Electronic device having extension port and utilization method of extension port

An electronic device having an extension port, comprising:

• a shell;
• an original type-C universal serial bus (USB) port, mounted on the shell, and comprising a positive data (D+) pin, a negative data (D−) pin, a first configuration channel (CC1) pin, and a second configuration channel (CC2) pin;
• a port extension module, comprising:
• a processing unit, comprising a general-purpose input/output (GPIO), wherein the GPIO comprises a first enable pin, a second enable pin, a first switch control pin, a second switch control pin, a pair of USB mode detection pins, and a pair of first signal pins;
• a signal isolation circuit, electrically connected to the first enable pin, the second enable pin, and the pair of USB mode detection pins of the processing unit, and also electrically connected to the CC1 pin and the CC2 pin of the original type-C USB port;
• and
• a hub, comprising a plurality of type-C USB ports and at least one pogo pin female connector, and electrically connected to the first switch control pin, the second switch control pin, and the first signal pins of the processing unit;
• wherein the type-C USB ports and at least one pogo pin female connector are mounted on the shell;
• wherein when the signal isolation circuit respectively receives a first voltage signal from the first enable pin and from the second enable pin of the processing unit, and when the hub respectively receives a third voltage signal from the first switch control pin and from the second switch control pin of the processing unit, the signal isolation circuit controls the CC1 pin and the CC2 pin of the original type-C USB port to electrically connect the pair of USB mode detection pins of the processing unit according to the first voltage signal, and the hub controls the D+ pin and the D− pin of the original type-C USB port to electrically connect the pair of first signal pins of the processing unit according to the third voltage signal;
• wherein when the signal isolation circuit respectively receives a second voltage signal from the first enable pin and from the second enable pin of the processing unit, and when the hub respectively receives a fourth voltage signal from the first switch control pin and from the second switch control pin of the processing unit, the signal isolation circuit controls the CC1 pin and the CC2 pin of the original type-C USB port to become open circuit according to the second voltage signal, the signal isolation circuit also generates a host mode signal and outputs the host mode signal to the pair of USB mode detection pins of the processing unit, and the hub controls one of the type-C USB ports or the pogo pin female connector to electrically connect the pair of first signal pins of the processing unit and the D+ pin and the D− pin of the original type-C USB port according to the fourth voltage signal.