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HD6433636SW Datasheet(PDF) 287 Page - Renesas Technology Corp

Part # HD6433636SW
Description  8-Bit Microcomputer
PDF  418 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6433636SW Datasheet(HTML) 287 Page - Renesas Technology Corp

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Section 11 DTMF Generator
11.1
Overview
The H8/3637S Series has an on-chip dual-tone multifrequency (DTMF) generator that can
generate DTMF signals.
A DTMF signal accesses a telephone switching system by a pair of sine waves. Figure 11.1 shows
the frequency matrix. The DTMF generator generates frequencies corresponding to the numbers
and symbols on the keypad of a telephone set or facsimile machine.
1
4
7
2
5
8
0
3
6
9
#
A
B
C
D
R1 (697 Hz)
R2 (770 Hz)
R3 (852 Hz)
R4 (941 Hz)
Figure 11.1 DTMF Frequencies



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