FEDL7005-01

ML7005

16/25

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

DTT3

DTR3

DTT2

DTR2

DTT1

DTR1

DTT0

DTR0

DIGIT

Low group

signal (Hz)

High group

signal (Hz)

0

0

0

1

1

697

1209

0

0

1

0

2

697

1336

0

0

1

1

3

697

1477

0

1

0

0

4

770

1209

0

1

0

1

5

770

1336

0

1

1

0

6

770

1477

0

1

1

1

7

852

1209

1

0

0

0

8

852

1336

1

0

0

1

9

852

1477

1

0

1

0

0

941

1336

1

0

1

1

*

941

1209

1

1

0

0

#

941

1477

1

1

0

1

A

697

1633

1

1

1

0

B

770

1633

1

1

1

1

C

852

1633

0

0

0

0

D

941

1633