| Part Number | UPD4991A |
| Manufacturer | NEC |
| Title | 4-BIT PARALLEL I/O CALENDAR CLOCK |
| Description | 1. 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,... |
| 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 (... |
| Datasheet |
 UPD4991A Datasheet
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