"精致小巧的数字音乐盒设计：AT89C2051单片机实现"。

This design utilizes a single-chip microcontroller to create a digital music box. The hardware components of the music box include an AT89C2051 microcontroller, audio generator, audio amplifier, keypad circuit, reset circuit, and clock circuit. The music box is capable of playing three different songs, with the microcontroller controlling the internal timer to generate the desired music frequencies. Users can select their preferred songs using the keypad circuit and also have the option to pause and resume playback. Compared to traditional mechanical music boxes, the single-chip microcontroller design is more compact, simpler to manufacture, and produces higher quality music with the ability to play chord harmonies. Overall, this digital music box provides a modern and efficient solution for enjoying music in a small and elegant device.