RP/RF5C01A

2

PIN CONFIGURATIONS

CS

CS

ADJ

A0

RD

GND

18

17

16

15

14

13

12

11

10

Vcc

OSCOUT

OSCIN

ALARM

WR

1

2

3

4

5

6

7

8

9

CS

CS

ADJ

RD

GND

18

17

16

15

14

13

12

11

10

Vcc

OSCOUT

OSCIN

ALARM

WR

1

2

3

4

5

6

7

8

9

•

RP5C01A

•

RF5C01A

PIN DESCRIPTION

Pin No.

Symbol

Function

1,2

CS,CS

The CS and CS are used to interface with external devices. Enabled when CS =“H” and

CS=“L”. The CS is connected to the power down detector in the system power supply

while the CS is connected to the microcomputer.

3

ADJ

The ADJ can easily correct seconds without using the CPU. When this pin is set to “H” the

second digits ranging from 00 to 29 are set to 0, the second digits ranging from 30 to 59 are

set to 0 and minute digits are incremented by 1.

4,5,6,7

Input pin for the address signal. These pins are connected to the CPU address bus.

8

RD

Input pin for I/O control. The RD is set to “L” when data is transferred from the

RP/RF5C01A to the CPU.

9

GND

Ground pin for the power supply of 0V.

10

WR

Input pin for I/O control. The WR is set to “L” when data is transferred from the CPU to

the RP/RF5C01A.

11,12,13,14

Bidirectional data bus. Connected to the data bus of the CPU.

15

ALARM

The ALARM pin outputs alarm signals and 16Hz and 1Hz clock pulses.

This pin is an open drain output.

16,17

OSCIN,OSCOUT

The OSCIN and OSCOUT are connected to the crystal oscillator of 32.768kHz

18

Input pin for the power supply of +5V.