SERIAL I/O CALENDAR & CLOCK CMOS LSI

The µPD4990A is a CMOS LSI developed to input/output calendar & clock data serially to/from the micro computer. The crystal frequency is 32.768 kHz and the data items included are time, minute, second, year, month, day, and week.

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.