Input/output module

An input/output module electrically coupled between a control circuit and an input/output pin, the input/output module comprising:

• a pre-driver, electrically coupled to the control circuit, for generating a pull-up selection signal and a pull-down selection signal according to logic levels of an input signal and an enable signal generated by the control circuit;
• and
• a post-driver, electrically coupled between the pre-driver and the input/output pin, for changing a voltage level of the input/output pin according to the pull-up selection signal and the pull-down selection signal, wherein the post-driver comprises:
• a pull-up circuit, electrically coupled to the pre-driver, for selectively conducting a supply voltage to the input/output pin in response to the pull-up selection signal;
• a pull-up resistor, electrically coupled between the pull-up circuit and the input/output pin;
• a pull-down circuit, electrically coupled to the pre-driver, for selectively conducting a ground voltage to the input/output pin in response to the pull-down selection signal;
• and
• a pull-down resistor, electrically coupled between the pull-down circuit and the input/output pin,
• wherein at least one of the pull-up circuit and the pull-down circuit receives a core voltage from the control circuit, wherein
• when the enable signal is at a first logic level, the post-driver sets the input/output pin to be in a high-impedance state, and
• when the enable signal is at a second logic level, the post-driver changes the voltage level of the input/output pin according to the logic level of the input signal, wherein the first logic level and the second logic level are inverted, and the pull-up selection signal, the pull-down selection signal, and the core voltage are lower than the supply voltage.