DATA SHEET MOS INTEGRATED CIRCUIT µPD4990A 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...

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