DS12C887c DS12C887 real-time clock chip is rich in functions and can be used to directly replace the clock calendar chip DS12887 on IBM PC. At the same time, its pins are also compatible with MC146818B and DS12887. Since DS12C887 can automatically generate time information such as century, year, month, day, hour, minute, second, etc., and a century register is added inside, the sub-millennium problem is solved by hardware circuit; DS12C887 has its own lithium battery, and when the external power is off, its internal time information can still be maintained for 10 years; for time recording within a day, there are two modes: 12-hour system and 24-hour system. In the 12-hour mode, AM and PM are used to distinguish between morning and afternoon. There are also two ways to express time, one is binary number and the other is BCD code. The DS12C887 has 128 bytes of RAM, of which 11 bytes are used to store time information, 4 bytes are used to store control information of the DS12C887, called control registers, and 113 bytes of general RAM are for users to use. In addition, users can also program the DS12C887 to achieve a variety of square wave outputs, and can mask its internal three-way interrupts through software.
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