Microcontroller, control system, and control method

A control system, comprising:

• an external device comprising:
• a plurality of buttons;
• a plurality of sensors, each detecting a pressed state of one of the buttons to generate a sampled signal;
• a switch circuit outputting the sampled signals according to a switching signal;
• a microcontroller comprising:
• an input-output interface outputting the switching signal to the switch circuit and receiving the sampled signals;
• a conversion circuit converting the sampled signals to generate a plurality of converted signals;
• a control circuit generating and adjusting the switching signal;
• a storage circuit storing the converted signals;
• and
• a CPU circuit operating according to the converted signals stored in the storage circuit in response to an interrupt signal being enabled,
• wherein in response to a specific event occurring, the control circuit enables the interrupt signal.

A control method for a PDMA circuit, comprising:

• generating a switching signal;
• providing the switching signal to an external device;
• triggering a conversion circuit to convert the first sampled signal from the external device;
• determining whether a specific event occurs;
• in response to the specific event not occurring:
• storing the output of the conversion circuit to a storage circuit;
• controlling the external device to output a second sampled signal;
• converting the second sampled signal;
• and
• determining whether the specific event occurs;
• and
• in response to the specific event occurring:
• storing the output of the conversion circuit in the storage circuit;
• and
• sending an interrupt signal to a CPU circuit so that the CPU circuit operates according to the data stored in the storage circuit.