msm7715 Oki Semiconductor, msm7715 Datasheet - Page 15

• Manufacturer Part Number: msm7715
• Description: Multi-function Telecommunication Lsi
• Manufacturer: Oki Semiconductor

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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.
D
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
697
*
*
*
*
Low-group signal (Hz)
770
*
*
*
*
852
*
*
*
*
941
*
*
*
*
Table 2 DTMF Signal Codes
1209
*
*
*
*
High-group signal (Hz)
1336
*
*
*
*
1477
*
*
*
*
1633
*
*
*
*
DTG4
DT4
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
DTG3
DT3
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
DTG2
DT2
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
MSM7715
DTG1
15/21
DT1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0