W83977F-A Datasheet, PDF (12/182 Pages) Winbond – WINBOND I/O

W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
Real Time Clock
y 27 bytes of clock, On-Now, and control/status register (14 bytes in Bank 0 and 13 bytes in Bank
2); 242 bytes of general purpose RAM
y BCD or Binary representation of time, calendar, and alarm registers
y Counts seconds, minutes, hours, days of week, days of month, month, year, and century
y 12-hour/ 24-hour clock with AM/PM in 12-hour mode
y Daylight saving time option; automatic leap-year adjustment
y Dedicated alarm (Alarm B) for On-Now function
y Programmable delay-time between panel switch off and power supply control
y Software control power-off; various and maskable events to activate system Power-On
y System Management Interrupt ( SMI ) for panel switch power-off event
General Purpose I/O Ports
y 14 programmable general purpose I/O ports; 6 dedicate, 8 optional
y General purpose I/O ports can serve as simple I/O ports, interrupt steering inputs, watching dog
timer output, power LED output, infrared I/O pins, general purpose address decoder, KBC control
I/O pins.
Package
y 128-pin PQFP
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