UPD4991A Datasheet | NEC

DATA SHEET MOS INTEGRATED CIRCUIT µPD4991A 4-BIT PARALLEL I/O CALENDAR CLOCK The µPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microputer and includes an alarm function. Its reference oscillation frequency is 32.768 kHz. Hour, minute, second, year, month, day, and date data is stored internally. The µPD4991A consumes 30 % less power than the µPD4991. Features : - Time (hour, minute, and second) and calendar (leap year, year, month, day, and date) counters - Leap year can be automatically identified or set - 12- and 24-hour modes selectable - 4-bit parallel input/output in BCD data format - Alarm...