DS12CR887实时时钟芯片功能丰富，其正常工作电压为3.3 V，工作电压范围为2.97 V～3.63 V，是应用在DSP硬件电路中的理想时钟芯片。DSl2CR887的具体的特性如下：



(1) 具有10字节RAM用来存储时间信息。能够自动产生年、月、日、时、分、秒、星期等时间信息，并且有时、分、秒的闹铃功能，温度25℃时每个月的时间误差在±1分钟以内。



(2) 内部自带电池，外部掉电时，温度25℃时其内部时间信息能够保持5年之久。



(3) 对于一天内的时间记录，有12小时制和24小时制两种模式。在12小时制模式中，用AM和PM区分上午和下午。



(4) 时间有二进制数和BCD码两种表示方法。



(5) 内置128字节RAM，其中10字节RAM用来存储时间信息，4字节RAM用来存储控制信息，称为控制寄存器，114字节的通用RAM可供用户使用。



(6) 用户还可对DS12C887进行编程

-DS12CR887 real-time clock chips, and the normal function of rich working voltage is 3.3 V, working voltage range as 2.97 V- a 3.63 V, is used in digital signal processor (DSP) hardware circuit of the ideal clock chip. The specific characteristics of DSl2CR887 are as follows:



(1) is used to store the RAM 10 bytes. Automatically generate year, month, day, week, minutes and seconds, such time information, and sometimes, minutes and seconds of alarm functions, while 25 degrees Celsius temperature per month during the time error within ± 1 minute.



(2) internal cabin batteries, external power, the internal temperature of 25 degrees Celsius can keep time information for 5 years.



(3) for the time of day, 12 hours and 24 hours of two kinds of patterns. In 12 hours system model, AM and PM distinction in the morning and afternoon.



(4) time is binary number and BCD two methods.



Built-in 128 bytes (5), including 10 bytes RAM is used to store information, RAM four bytes RAM time is us