Data storage apparatus having volatile memory and nonvolatile memory and
data indication means for indicating memory storing data
    2.
    发明授权
    Data storage apparatus having volatile memory and nonvolatile memory and data indication means for indicating memory storing data 失效
    具有易失性存储器和非易失性存储器的数据存储装置和用于指示存储数据的存储器的数据指示装置

    公开(公告)号:US5438679A

    公开(公告)日:1995-08-01

    申请号:US796549

    申请日:1991-11-21

    CPC分类号: G06F11/1441 G11C11/005

    摘要: Data input from a key switch is displayed on a liquid crystal display, and whether to store the data in a RAM or an EEPROM is selected by a selection switch. If the EEPROM is selected, a CPU turns on a power switch to apply a high voltage to the EEPROM to write the input data therein. Data stored in the RAM and the EEPROM are read out upon operation of a search switch and are sequentially displayed on the liquid crystal display. It is clearly indicated on the display whether the currently displayed data is read out from the RAM or the EEPROM. With this operation, if data which is required to be protected against disconnection of a power supply voltage or a drop in power supply voltage is stored in the RAM, the data can be stored in the EEPROM.

    摘要翻译: 来自键开关的数据输入显示在液晶显示器上,并且通过选择开关选择是否将数据存储在RAM或EEPROM中。 如果选择了EEPROM,则CPU打开电源开关,向EEPROM施加高电压以将输入数据写入其中。 存储在RAM和EEPROM中的数据在搜索开关操作时被读出,并被顺序地显示在液晶显示器上。 显示屏上是否清楚地显示当前显示的数据是从RAM或EEPROM读出的。 通过该操作,如果RAM中存储有要防止断开电源电压或电源电压下降的数据,则可以将数据存储在EEPROM中。