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| HD404669 Datasheet, PDF (97/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit | |||
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VTref
GND
Switch control
HD404669 Series
TONER
TONEC
Figure 74 Tone Output Equivalent Circuit
VTref
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
GND
Time slots
Figure 75 Waveform of Tone Output
97
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