UPD4991A Datasheet (NEC) - 4-BIT PARALLEL I/O CALENDAR CLOCK

UPD4991A, 4-BIT PARALLEL I/O CALENDAR CLOCK

BASIC TIME MODE (MODE = 0 * 0 0 B) * Thirteen types of counters are provided: 10-year, 1-year, 10-month, 1-month, 10-day, 1-day, date, 10-hour, 1hour, 10-minute, 1-minute, 10-second, and 1-second.

* Date codes are 00H through 06H (0000 through 0110B).

(Correspondence between d

UPD4991A 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 function (hour, minu