UPD9930 datasheet(48/78 Pages) NEC

48 / 78 page

µPD9930

TNGCR

TNGAIN4 TNGAIN3 TNGAIN2 TNGAIN1 TNGAIN0

TNGAIN4 to TNGAIN0

00000 to 11111

Tone gain selection (Refer to Table 4-7 Function

Specification by Tone Gain Control Register).

0 to –30 dB (1 dB steps), –38.5 dB

Table 4-6 Function Specification by Tone Control Register

TONCR

HEXNote

D7 D6

XXXX

Tone stop

A0H 05H

00001

Continuous single tone generation

A1H 85H

00011

31.25 ms intermittent single tone generation

A3H C5H

00101

200 ms intermittent single tone generation

A5H A5H

00111

250 ms intermittent single tone generation

A7H E5H

01001

500 ms intermittent single tone generation

A9H 95H

01011

1 s intermittent single tone generation

ABH D5H

01101

GSM triple tone generation

ADH B5H

01111

200 ms one-shot single tone generation

AFH F5H

10001

Continuous dual tone generation

B1H 8DH

10011

31.25 ms intermittent dual tone generation

B3H CDH

10101

200 ms intermittent dual tone generation

B5H ADH

10111

250 ms intermittent dual tone generation

B7H EDH

11001

500 ms intermittent dual tone generation

B9H 9DH

11011

1 s intermittent dual tone generation

BDH BDH

11111

200 ms one-shot dual tone generation

BFH FDH

Note M: HEX value with MSB first

L: HEX value with LSB first

Remark X: Don't care

4.3.4 Tone Gain Control Register (TNGCR)

This is a 5-bit register for controlling the tone output gain.

Figure 4-12 Tone Gain Control Register

Tone control conditions

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