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DTMFT and DTMFR Registers

16 kinds of DTMF transmit signals can be determined by setting the DTMFT register.

16 kinds of DTMF receive signals can be monitored from the DTMFR register.

The table 3 shows the DTMF signal codes.

Even if the DTMF transmit code is changed while the DTMF signal is being transmitted

(MFC="1"), the output frequency is not changed.

Table 3 DTMF Signal Code List

High group

signal (Hz)

Low group

signal (Hz)

1209

1336

697

697

1477

697

1209

770

DIGIT

1

2

3

4

DTT0

DTR0

1

0

1

0

DTT1

DTR1

0

1

1

0

DTT2

DTR2

0

0

0

1

DTT3

DTR3

0

0

0

0

1336

770

5

1

0

1

0

1477

770

6

0

1

1

0

1209

852

7

1

1

1

0

1336

852

8

0

0

0

1

1477

852

9

1

0

0

1

1336

941

0

0

1

0

1

1209

941

*

1

1

0

1

1477

941

#

0

0

1

1

1633

697

A

1

0

1

1

1633

770

B

0

1

1

1

1633

852

C

1

1

1

1

1633

941

D

0

0

0

0