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PDF UM82C6818 Data sheet ( Hoja de datos )
| Número de pieza | UM82C6818 | |
| Descripción | Real Time Clock Plus RAM | |
| Fabricantes | UMC | |
| Logotipo |  |
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UM82C6818
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Features
• Internal time base and oscillator
• Counts seconds, minutes, and hours of the day
• Counts days of the week, date, month, and year
• 3V to 6V operation
• Time base input options: 4.194304 MHz, 1.048576 MHz,
or 32.768 kHz
• Time base osci lIator for parallel resonant crystals
• Binary or BCD representation of time, calendar, and
alarm
• 12 or 24-hour clock with AM and PM in 12-hour mode
• automatic end of month recognition
• automatic leap year compensation
• Multiplexed bus for pin efficiency
General Description
The UM82C6818 Real-Time Clock plus RAM is fabricated
in high performance CMOS process to interface with 1MHz
processor buses. It combines three unique features: a
• Interfaced with software as 64 RAM locations
- 14 bytes of clock and control registers
- 50 bytes of general purpose RAM
• Status bit indicates data integrity
• Bus compatible interrupt signals (IRQ)
• Three interrupts are separately software maskable and
testable
Time-of-day alarm, once-per-second to once-per-day
- Period ic rates from 30 .51ls to 500 ms
- End-of-clock update cycle
• Programmable square-wave output signal
• Clock output may be used as microprocessor clock input
- At ti me base frequency +1 or +4
complete time-of-day clock with alarm and one hundred
year calendar, a programmable periodic interrupt and
square-wave generator, and 50 bytes of static RAM.
Pin Configuration
Block Diagram
7-186
1 page | ||
| Páginas | Total 1 Páginas | |
| PDF Descargar | [ Datasheet UM82C6818.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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