HD404618TF datasheet(65/91 Pages) RENESAS

65 / 91 page

HD404618 Series

400 kHz (selected at TGSP reset)

800 kHz

TGSP

flag

TONER

VTref

TONEC

Sine wave

counter D/A

Transformed

programmable

divider

Transformed

programmable

divider

Sine wave

counter D/A

DTMF

Feedback

Figure 40 DTMF Circuit Block Diagram

Tone Generator Mode Register (TGM: $010):

Four-bit write-only register which controls output

frequencies (see table 30). It is cleared to $0 by MCU reset.

Table 30 Tone Generator Mode Register

TGM

Bit 3

Bit 2

Bit 1

Bit 0

Output Frequencies

Option

(TONER output

is not affected)

R1 (697 Hz)

Output through

TONER pin

R2 (770 Hz)

R3 (852 Hz)

R4 (941 Hz)

Option

(TONEC output is not affected)

C1 (1,209 Hz)

Output through

TONEC pin

C2 (1,336 Hz)

C3 (1,477 Hz)

C4 (1,633 Hz)

Tone Generator Control Register (TGC: $011): Three-bit write-only register which controls the start

and stop of DTMF signal output (see table 31). It is cleared to $0 by MCU reset.

HD404618TF Datasheet(PDF) 65 Page - Renesas Technology Corp

HD404618TF Datasheet(HTML) 65 Page - Renesas Technology Corp

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