73K321L Ver la hoja de datos (PDF) - TDK Corporation
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73K321L Datasheet PDF : 24 Pages
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73K321L
CCITT V.23, V.21
Single-Chip Modem
TONE REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
TR
RXD
TRANSMIT TRANSMIT TRANSMI DTMF 3 DTMF 2/ DTMF 1
DTMF 0/
011 OUTPUT CALLING ANSWER T DTMF
V.234W/
ANS. TONE/
CONTR.
TONE
TONE
FDX
SPECIAL
TONE/ SEL
BIT NO.
NAME
CONDITION
DESCRIPTION
D0
DTMF 0/
D6 D5 D4 D0 D0 interacts with bits D6, D5, D4, and CR0 as shown.
Answer Tone/
X X 1 X Transmit DTMF tones.
Special Tone/
Detect/Select
X X 0 0 Mark of an FSK mode selected in CR0 is to be
detected in D2 of DR.
X X 0 1 2100 Hz answer tone will be detected in D2 of DR if
V.21 Originate mode is selected in CR0.
1300 Hz calling tone will be detected in D2 of DR if
V.21 or V.23 Answer mode is selected in CR0.
X 1 0 0 Transmit 2225 Hz answer tone in Answer mode.
X 1 0 1 Transmit 2100 Hz answer tone in Answer mode.
D2
CR0
TR
DTMF2/
D7 D5 D4 D2 D2
V.23 4W/FDX
0 1 1 0 0 2-wire half duplex
0 1 1 0 1 4-wire full duplex
D3, D2,
D1, D0
DTMF 3,
2, 1, 0
D3 D2 D1 D0 Programs 1 of 16 DTMF tone pairs that will be transmitted
when TX DTMF (TR bit D4) and TX enable bit (CR0, bit
0 0 0 0 – D2) are set. Tone encoding is shown below:
1 1 11
KEYBOARD
DTMF CODE
TONES
EQUIVALENT
D3 D2 D1 D0 LOW HIGH
1
0 0 01
697
1209
2
0 0 10
697
1336
3
0 0 11
697
1477
4
0 1 00
770
1209
5
0 1 01
770
1336
6
0 1 10
770
1477
7
0 1 11
852
1209
8
1 0 00
852
1336
9
1 0 01
852
1477
0
1 0 10
941
1336
11
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