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HD6433636SW Folha de dados(PDF) 294 Page - Renesas Technology Corp

Nome de Peças HD6433636SW
Descrição Electrónicos  8-Bit Microcomputer
PDF  418 Pages
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Fabricante Electrônico  RENESAS [Renesas Technology Corp]
Página de início  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433636SW Folha de dados(HTML) 294 Page - Renesas Technology Corp

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11.3
Operation
11.3.1
Output Waveform
The DTMF generator outputs a row-group or column-group sine wave (DTMF signal) or a
combined row-column waveform at the TONED pin. These signals are generated by a high-
precision resistor-ladder-type D/A converter circuit. The output frequency is selected by DTCR.
Figure 11.3 shows an equivalent circuit for the TONED output. Figure 11.4 shows the output
waveform of an independent row-group or column-group signal. One cycle of the output is
divided into 32 segments, giving a stable output with low distortion.
Control
Output
control
Row
Column
VT
GND
ref
TONED
Figure 11.3 Equivalent Circuit for TONED Output
123456789 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Time slot
VT
GND
ref
Figure 11.4 TONED Output Waveform (Independent Row- or Column-Group Output)



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