RS5C62 Просмотр технического описания (PDF) - RICOH Co.,Ltd.

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RS5C62

REAL-TIME CLOCK

RICOH Co.,Ltd. 

RP/RF/RS5C62

PIN CONFIGURATION

• RP5C62 (18pin DIP)

• RF5C62 (18pin SOP)

• RS5C62 (20pin SSOP)

1

CS

18 VDD

CE 2 17 OSCOUT

TMOUT 3 16 OSCIN

CS

1

A0 4 15 INTR

CE

2

A1 5 14 D3

TMOUT

3

A0

4

A2 6 13 D2

A1

5

A3 7 12 D1

A2

6

RD 8 11 D0

VSS 9 10 WR

A3

7

RD

8

VSS

9

18

VDD

CS

1

17

OSCOUT

CE

2

16

OSCIN TMOUT

3

15

INTR

14

D3

13

D2

NC

4

A0

5

A1

6

A2

7

12

D1

A3

8

11

D0

RD

9

10

WR

VSS

10

20

VDD

19

OSCOUT

18

OSCIN

17

NC

16

INTR

15

D3

14

D2

13

D1

12

D0

11

WR

PIN DESCRIPTION

Pin No. Symbol

Name

1

CS Chip select input

2

CE Chip enable input

Function

CS and CE are used when interfacing external devices. They may be accessed

when CS is low and CE is high. CE is connected to an output of power down

detector on the system power supply side, and CS is connected to the microcom-

puter address bus.

3 TMOUT Timer output

Timer output may be used as an interrupt free-run timer or watchdog timer.

When CE is low (running on battery backup), operation stops (there is no output).

It is N-ch open drain output.

4–7 A0 –A3 Address input

Address input is connected to the CPU address bus. It is gated internally with CE.

When RD falls from high to low, the contents of the counters or registers specified

8

RD Read control input by A0 to A3 are output to D0 to D3. It is valid when CS is low and CE is high. It is

CMOS input.

When WR falls from high to low or rises from low to high, the contents of D0 to

10

WR Write control input D3 are written to registers or counters specified by A0 to A3. WR is valid when CS

is low and CE is high. It is CMOS input.

11–14 D0–D3 Bi-directional data

bus

15 INTR Interrupt output

D0 to D3 are connected to the CPU data bus. The input section is gated internally

with CE. It is CMOS input/output.

INTR outputs cyclic interrupts or alarm interrupts to CPU. It also operates when

CE is low (at battery backup). It is N-ch open drain output.

16 OSCIN Oscillator circuit

17 OSCOUT input/output

18

VDD Power supply

9

VSS

Crystal oscillator of 32.768kHz must be connected between OSCIN and OSCOUT.

Capacitance is connected externally between VDD and OSCIN and VDD and

OSCOUT, forming the oscillator circuit.

VDD connects to +5V or +3V and VSS to ground.

*) The pin numbers marked in the above table indicate the pins on the 18pin packages.

2

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