采用单片计算机技术的便携式智能仪器在使用过程中,往往需要保持用户设定的信息和运行结果等,即要求应用系统扩展RAM中的数据在电源掉电时不丢失,重新加电后RAM中的数据能保持完好。一般的做法仅仅是对RAM进行数据保护。便携式智能仪器大多采用干电池作为直流电源,关机时切断了除数据存储器芯片以外几乎所有芯片的供电,以求最大限度地降低整机功耗,因此如对数据保护问题不采取相应的措施或处理不当,就可能造成RAM中的信息丢失和出错,致使整个应用系统不能可靠工作,甚至造成无 The use of single-chip computer technology, portable smart instruments in the use of the process, often need to maintain the user set the information and operating results, etc., which requires the application system to expand the data in RAM power failure does not lose, re-power after the RAM The data can be kept intact. The general approach is only to RAM for data protection. Most of the portable smart instruments use dry batteries as the DC power supply, shutting off the power supply of almost all the chips except the data memory chips in shutdown in order to minimize the power consumption of the whole machine. Therefore, if the data protection problems are not taken correspondingly or handled improperly , It may result in the loss of information in RAM and error, resulting in the entire application system can not work reliably, or even cause no