Maxim Integrated 73M2901CE AT Command - Manual (Page 24)

73M2901CE AT Command User Guide UG_2901CE_027
24 Rev. 2.0
4.4.13 S12 – DTMF / Twist Dial Register
(Default = 20h)
Register S12 reflects the status of the DTMF options.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Reserved TWIST2 TWIST1 TWIST0 DTMF3 DTMF2 DTMF1 DTMF0
DTMF3 DTMF2 DTMF1 DTMF0 Digit Low Tone High Tone
0 0 0 0 D 941 1633
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
TWIST2 TWIST1 TWIST0 Relative Level
0 0 0 0 dB nominal.
0 0 1 1 dB low frequency below the high frequency tone.
0 1 0 2 dB low frequency below the high frequency tone
(default).
0 1 1 3 dB low frequency below the high frequency tone.
1 0 0 4 dB low frequency below the high frequency tone.
1 0 1 5 dB low frequency below the high frequency tone.
1 1 0 6 dB low frequency below the high frequency tone.
1 1 1 7 dB low frequency below the high frequency tone.
Note: For normal operation, only the twist needs to be set. The digit is filled in automatically when dialing.