关键词: 51单片机, 低功耗, 休眠, 掉电模式

Abstract: For the needs of low-power applications， a series of low-power setting methods about AT89 series 51 MCU system was presented， respectively， from hardware and software perspectives. Test results proved that these methods can effectively reduce power consumption of the system. They also provided a reference for low-power design of other types of MCU system.

Key words: 51 MCU, low power consumption, sleep mode, power down mode