在各种微机应用系统中,常需存放一些在掉电后仍保存的数据,如系统控制数据、调整参数等。这些数据量比较小,一般只需几十个字节左右,但可靠性要求较高,要求在各种情况下都不至丢失数据。 EEPROM可完成掉电数据保存功能,但常见的2816、2817、2864等芯片,一方面容量太大(价格、体积也大),另一方面可靠性较低,如不采取措施,在开机、关机时常会丢失个数据。为此,本文将介绍一种价廉、体积很小、串行接口的EEPROM——MCM2814, In a variety of computer applications, often need to store some of the data still stored after the power-down, such as system control data, adjust the parameters. The amount of data is relatively small, usually only dozens of bytes or so, but the reliability of the higher requirements in all circumstances require no loss of data. EEPROM can be completed power-down data save function, but the common 2816,2817,2864 other chips, on the one hand the capacity is too large (price, size is also large), on the other hand, low reliability, such as not taking measures, at boot, shutdown Often lose a data. To this end, this article will introduce a cheap, small size, serial interface EEPROM - MCM2814,