関連ワード:  why we need microcontroller    why we use microcontroller    why we use microcontroller instead of microprocessor    why we use microcontroller in arduino    why we use 8051 microcontroller    why we use esp32 microcontroller    why we need clock in microcontroller    why we use pic microcontroller    why we need crystal oscillator in microcontroller    why do we need interrupt in microcontroller