MSM7715 データシートの表示（PDF） - Oki Electric Industry

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MSM7715

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

MSM7715

DTMF signal code

Sixteen types of DTMF transmit signals can be set by using DTG1 to DTG4. Also, sixteen types

of DTMF receive signals can be monitored by using DT1 to DT4. Table 2 shows the DTMF signal

codes.

Table 2 DTMF Signal Codes

Button

1

2

3

4

5

6

7

8

9

0

*

#

A

B

C

D

Low-group signal (Hz)

697 770 852 941

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

High-group signal (Hz)

1209 1336 1477 1633

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

DT4 DT3 DT2 DT1

DTG4 DTG3 DTG2 DTG1

0

0

0

1

0

0

1

0

0

0

1

1

0

1

0

0

0

1

0

1

0

1

1

0

0

1

1

1

1

0

0

0

1

0

0

1

1

0

1

0

1

0

1

1

1

1

0

0

1

1

0

1

1

1

1

0

1

1

1

1

0

0

0

0

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