RF5C62 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RF5C62

REAL-TIME CLOCK

RICOH Co.,Ltd. 

REAL-TIME CLOCK

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.

FEATURES

• 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.

BLOCK DIAGRAM

OSCIN

OSCOUT

OSC

DIV

OSC DETECT

WATCH & CALENDAR

COMPARATOR

INTERRURT

CONTROL

INTR

CE

ALARM REGISTER

CS

TMOUT

RD

TIMER

WR

CONTROL REGISTER

DATA BUS

CONTROL

ADDRESS BUS ADDRESS

CONTROL

DECODER

VDD

VSS

D0D1D2D3

A0 A1 A2 A3

1

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