W83977F Datasheet, PDF (15/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
PRELIMINARY
Real Time Clock
• 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
• BCD or Binary representation of time, calendar, and alarm registers
• Counts seconds, minutes, hours, days of week, days of month, month, year, and century
• 12-hour/ 24-hour clock with AM/PM in 12-hour mode
• Daylight saving time option; automatic leap-year adjustment
• Dedicated alarm (Alarm B) for On-Now function
• Programmable delay-time between panel switch off and power supply control
• Software control power-off; various and maskable events to activate system Power-On
• System Management Interrupt ( SMI ) for panel switch power-off event
General Purpose I/O Ports
• 14 programmable general purpose I/O ports; 6 dedicate, 8 optional
• 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
• 128-pin PQFP
Publication Release Date: March 1998
-4-
Revision 0.58