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单片机具有体积小、功能齐全的优点,因此在各种控制领域中得到了广泛的应用。大多数的单片机都提供一种低功耗的停电工作方式,它能保持片内 RAM的内容。这种方式在实际应用中非常有用。如果每次开机时需要置入一些相同的参数,采用这种方式后,只需在第一次开机时置入,以后开机时就不必再置了。又如需要对每天的测量数据进行累计计数时,也能很方便地实现。下面以 MCS-48系列单片机为例,介绍这种功能的使用。MCS-48系列单片机都有一电源引脚 V_(DD),在断电后由备用电池通过该引脚向片内 RAM 供电,以保
Microcontroller with small size, full-featured advantages, so in a variety of control areas have been widely used. Most microcontrollers provide a low-power black-out mode of operation that maintains the contents of on-chip RAM. This method is very useful in practical applications. If you need to put in some of the same parameters each time you boot, using this method, just put in the first boot, boot later do not have to reset. Another example is the need for the daily measurement of the cumulative count, but also can be easily achieved. The following MCS-48 series MCU, for example, describes the use of this feature. MCS-48 series microcontrollers have a power pin V_ (DD), after the power outage by the backup battery power supply to the on-chip RAM through this pin to protect