73K224BL データシートの表示（PDF） - Teridian Semiconductor Corporation

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73K224BL

V.22bis, V.22, V.21, Bell 212A, 103 Single-Chip Modem w/ Integrated Hybrid

Teridian Semiconductor Corporation 

73K224BL

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

Single-Chip Modem w/ Integrated Hybrid

DATA SHEET

TONE REGISTER (continued)

TR

ADDR

011

BIT

D5

D6

D7

D7

D6

D5

D4

D3

D2

D1

D0

RXD

TRANSMIT

OUTPUT GUARD

CONTROL

TONE

TRANSMIT

ANSWER

TONE

TRANSMIT

DTMF

DTMF 3

DTMF 2/

4-WIRE

FDX

DTMF 1/

EXTENDED

OVER-

SPEED

DTMF 0/

ANSWER

GUARD

NAME

CONDITION DESCRIPTION

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

with DR bit D2 in originate mode (see Detect Register

description).

Transmit

0 0 X Disables answer tone generator.

Answer Tone 1 0 0 In answer mode, a Bell 2225 Hz tone is transmitted

continuously when the transmit enable bit is set.

1 0 1 Likewise, a CCITT 2100 Hz answer tone is transmitted.

Transmit

0

Disables guard tone generator.

Guard Tone

1

Enables guard tone generator (see D0 for selection of

guard tones). Bit D4 must be zero.

RXD Output

0

Enables RXD pin. Receive data will be output on RXD.

Control

1

Disables RXD pin. The RXD pin reverts to a high

impedance with internal weak pull-up resistor.

Page: 16 of 33

© 2005, 2008 TERIDIAN Semiconductor Corporation

Rev 7.1

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