HD404669 Datasheet, PDF(92/142 Page) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

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HD404669 Datasheet, PDF (92/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit

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HD404669 Series

TONER

VTref

Sine wave

counter D/A

Transformation

program divider

Feedback

TONER output control

TONEC

Sine wave

counter D/A

Transformation

program divider

Feedback

2

Tone generator

mode register

(TGM)

Tone generator

2

control register

(TGC)

fOSC

TONEC output control

1/2

400 kHz*

1/5

2

System clock

select register 1

(SSR1)

1/9*

System clock

select register 2

1/10

(SSR2)

1/18*

1/20

2

Data bus

Clock line

Signal line

Note: * 397.8 kHz when an fOSC frequency of 3.58 MHz or 7.16 MHz is used.

Figure 69 Block Diagram of DTMF Circuit

92

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