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实时时钟ＣＭＯＳＲＡＭ电路是微机系统板的外围设备子系统中不可缺少的组成部分。通常采用的主芯片是ＭＯＴＯＲＯＬＡ公司生产的ＭＣ１４６８１８或与之兼容的８２Ｃ２０６芯片。它包括：一百年日历、报警、一个可编程周期性中断的全日制时钟以及１１４字节的低能耗静态存贮
Real-time clock CMOSRAM circuit is an integral part of the peripheral subsystem of the microcomputer system board. The main chip is usually used by Motorola MOTOROLA MC146818 or compatible with the 82C206 chip. It includes: a hundred year calendar, alarm, full-time clock with one programmable periodic interrupt and 114 bytes of low-power static storage