Datasheet Summary
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 puter. The crystal frequency is 32.768 kHz and the data items included are time, minute, second, year, month, day, and week.
Features
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- 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. mands can be set by inputting serial data. Selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz and...