Sharp R-1482, R-1480, R-1481 Pin No, Description, Signal to sound buzzer, Auto clear terminal

R-1480

R-1481

R-1482

Pin No.

Signal

I/O

Description

22

P44

OUT

Terminal not used.

23

P43

OUT

Signal to sound buzzer.

0.1 sec

A: key touch sound.

A

B: Completion sound.

2 sec

C: When the temperature of the oven cavity reaches

B

the preset temperature in the preheating mode,

1 sec

1 sec

H: GND

or when the preheating hold time (30 minutes) is

C

L

elapsed.

24

P42

IN

Terminal not used.

25

INT1

IN

Signal to synchronize LSI with commercial power source frequency.

This is the basic timing for all real time processing of LSI.

H : GND

L (-5V)

16.7 msec

26

P40

IN

Connected to VC.

27

RESET

IN

Auto clear terminal.

Signal is input to reset the LSI to the initial state when power is applied. Temporarily set

to "L" level the moment power is applied, at this time the LSI is reset. Thereafter set at "H"

level.

28-29

P71-P70

OUT

Terminal not used.

30

XIN

IN

Internal clock oscillation frequency setting input.

The internal clock frequency is set by inserting the ceramic filter oscillation circuit with

respect to XOUT terminal.

31

XOUT

OUT

Internal clock oscillation frequency control output.

Output to control oscillation input of XIN.

32

VSS

IN

Power source voltage:-5V.

VC voltage of power source circuit input.

33

P27

IN

Signal coming from touch key.

When any one of G12 line keys on key matrix is touched, a corresponding signal will be

input into P27. When no key is touched, the signal is held at "L" level.

34

P26

IN

Signal similar to P27.

When any one of G11 line keys on key matrix is touched, a corresponding signal will be

input into P26.

35

P25

IN

Signal similar to P27.

When any one of G10 line keys on key matrix is touched, a corresponding signal will be

input into P25.

36

P24

IN

Signal similar to P27.

When any one of G9 line keys on key matrix is touched, a corresponding signal will be input

into P24.

37-40

P23-P20

OUT

Digit selection signal.

The relationship between digit signal and digit are as follows;

Digit signal

Digit

H

P14

1st.

ß(60Hz)

P15

2nd.

L

GND

P16

3rd.

P14

VP

P17

4th.

P15

P20

5th.

P16

P21

6th.

P22

7th.

P17

P23

8th.

P20

(ß : INTO signal)

P21

Refer to the touch control panel circuit about the

P22

relation between signals and digits. Normally,

P23

one pulse is output in every synchronized signal

(ß)period, and input to the grid of the fluorescent display.

23