73K212AL 데이터 시트보기 (PDF) - TDK Corporation

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73K212AL

V.22, V.21, Bell 212A, Bell 103 Single-Chip Modem with Integrated Hybrid

TDK Corporation 

73K222BL

V.22, V.21, Bell 212A, Bell 103

Single-Chip Modem with Integrated Hybrid

TONE REGISTER (continued)

D7

D6

D5

D4

D3

D2

D1

D0

TR

RXD TRANSMIT TRANSMIT TRANSMIT DTMF 3 DTMF 2 DTMF 1/ DTMF 0/

011

OUTPUT GUARD

ANSWER

DTMF

OVER- ANSWER/

CONTR.

TONE

TONE

SPEED GUARD

BIT NO.

D3, D2,

D1, D0

NAME

DTMF 3, 2, 1, 0

D4

Transmit DTMF

CONDITION

DTMF CODE

D3 D2 D1 D0

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

0000

0

DESCRIPTION

Programs 1 of 16 DTMF tone pairs that will be

transmitted when TX DTMF (TONE, Bit D4) and TX

ENABLE bit (CR0, Bit D1) are set. Tone encoding is

shown below:

KEYBOARD

TONES

EQUIVALENT

LOW

HIGH

1

697

1209

2

697

1336

3

697

1477

4

770

1209

5

770

1336

6

770

1477

7

852

1209

8

852

1336

9

852

1477

0

941

1336

*

941

1209

#

941

1477

A

697

1633

B

770

1633

C

852

1633

D

941

1633

Disable DTMF.

1

Activates DTMF. The selected DTMF tones are

transmitted continuously when this bit is high and TX

ENABLE (CR0, Bit 1) is set to one. TX DTMF

overrides all other transmit functions.

D5

Transmit

D5 D4 D0 D5 interacts with bits D4 and D0 as shown.

Answer Tone

00X

Disables answer tone generator.

100

Enables answer tone generator. A 2225 Hz answer

tone will be transmitted continuously when the

TRANSMIT ENABLE bit is set in CR0. The device

must be in answer mode.

101

Likewise a 2100 Hz answer tone will be transmitted.

13

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