MC145740F 查看數據表（PDF） - Motorola => Freescale
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MC145740F Datasheet PDF : 12 Pages
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T3/D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
T2/D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
Table 4. Tone Frequency Truth Table
Tone Frequency (Hz)
DTMF Tx/Rx Mode Frequency
T1/D1
T0/D0
High Group Low Group
Keyboard
Equivalent
0
1
697
1209
1
1
0
697
1336
2
1
1
697
1477
3
0
0
770
1209
4
0
1
770
1336
5
1
0
770
1477
6
1
1
852
1209
7
0
0
852
1336
8
0
1
852
1477
9
1
0
941
1336
0
1
1
941
1209
*
0
0
941
1477
#
0
1
697
1633
A
1
0
770
1633
B
1
1
852
1633
C
0
0
941
1633
D
Single Tone
Mode
697
697
697
770
770
770
852
1336
1477
1336
1209
1477
1633
1633
1633
941
MC145740
10
MOTOROLA
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