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RP5C62 Datasheet(PDF) 5 Page - RICOH electronics devices division |
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RP5C62 Datasheet(HTML) 5 Page - RICOH electronics devices division |
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5 / 48 page  REAL-TIME CLOCK 1 RP/RF/RS5C62 OUTLINE The RP/RF/RS5C62 are CMOS LSIs which serve microcomputers as real-time clocks providing time, calendar, and alarm functions in direct coupling with the data buses of CPUs such as 8086 and 68000. A built-in timer counter acts as a watchdog timer or interrupt timer. They are available in three different types of packages: the DIP type, the SOP type, and the SSOP type. • Directly connected to CPU, enabling fast access. • 4bit bidirectional data bus, and 4bit address bus. • The oscillator is driven by a constant voltage, so the oscillation frequency is stable even when the power supply voltage fluctuates. • Built-in timer counter using internal clock. • Generates cyclic CPU interrupts, and generates alarm-match interrupts. • Interrupt flag and interrupt inhibit. • Clock (hour, minute, second), calendar (leap year, year, month, day, day-of-the-week), alarm (hour, minute). • 12-or 24-hour mode is selectable. • Recognizes leap years automatically. • All clock and alarm data expressed in BCD codes. • ±30 seconds adjustment function. • Determines whether clock data is valid or invalid. • Consumes very low power due to CMOS technology, so it can be backed up by batteries. • Power supply voltage between 3.0 to 5.0V. • Time keeping supply voltage between 2.0 to 6.0V. • Package : 18pin DIP for RP5C62, 18pin SOP for RF5C62, 20pin SSOP for RS5C62. FEATURES BLOCK DIAGRAM INTERRURT CONTROL TIMER CONTROL REGISTER ADDRESS BUS CONTROL DATA BUS CONTROL D0D1D2 DIV OSC DETECT OSC OSCIN OSCOUT CE D3 A0 A1 A2 A3 ADDRESS DECODER ALARM REGISTER COMPARATOR WATCH & CALENDAR VDD VSS TMOUT CS RD WR INTR |
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