UPD4990A Overview
Key Features
- Built-in counters for time (hour, minute, and second) and date (year, month, day, and week) Leap years are adjusted automatically
- Data is represented in BCD notation (except months in hexadecimal notation) and input/output serially
- Commands can be set by inputting serial data
- Selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz and selective output intervals are 1, 10, 30, and 60 seconds
