73K302L TDK [TDK Electronics], 73K302L Datasheet - Page 13

• Manufacturer Part Number: 73K302L
• Description: Single-Chip Modem
• Manufacturer: TDK [TDK Electronics]

TONE REGISTER
BIT NO.
D0
D1
D2
D3, D2, D1, D0
011
TR
OUTPUT
CONTR.
RXD
D7
Detect/Select
DTMF2/202T
Special Tone
DTMF 3, 2,
Overspeed
DTMF 0/
DTMF 1/
NAME
TRANSMIT
TURN-OFF
FDX
CARRIER
1, 0
TONE
SOFT
D6
D3 D2 D1 D0
0
1
D5
TRANSMIT
CONDITION
X
0
0
1
1
ANSWER
D4
0
0
TONE
0
1
D5
D4
1
0
0
0
0
0
1
0
1
D1
0
1
D0
X
0
1
0
1
0 -
1
TRANSMIT
DTMF
D4
13
DESCRIPTION
D0 interacts with bits D5, D4, and CR0 as shown.
D1 interacts with D4 as shown.
Transmit DTMF tones.
2225 Hz answer tone will be detected in D2 of DR if
originate mode is selected in CR0.
900 Hz SCT tone will be detected in D2 of DR if Bell 202
answer mode is selected in CR0.
Mark of an FSK mode selected in CR0 is to be detected
in D2 of DR.
2225 Hz answer tone will be generated when in answer
mode and transmit enable is selected in CR0.
2100 Hz answer tone will be generated when in answer
mode and transmit enable is selected in CR0.
Asynchronous DPSK 1200 bit/s +1.0% -2.5%.
Asynchronous DPSK 1200 bit/s +2.3% -2.5%.
Enables 202 half-duplex operation if TR D4 = 0
Enables 202 full-duplex operation if TR D4 = 0
Programs 1 of 16 DTMF tone pairs that will be transmitted
when TX DTMF and TX enable bit (CR0, bit D1) are set.
Tone encoding is shown below:
EQUIVALENT
KEYBOARD
1
2
3
4
5
6
7
8
9
0
DTMF 3
D3
DTMF 2/
D3 D2 D1 D0
0
0
0
0
0
0
0
1
1
1
DTMF CODE
FDX
202
D2
Single-Chip Modem
Bell 212A, 103, 202
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
DTMF 1/
SPEED
OVER-
1
0
1
0
1
0
1
0
1
0
D1
LOW
697
697
697
770
770
770
852
852
852
941
TONES
TONE SEL
SPECIAL
DTMF 0/
HIGH
D0
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336