73K302L TDK [TDK Electronics], 73K302L Datasheet - Page 10

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

Bell 212A, 103, 202
Single-Chip Modem
CONTROL REGISTER 0
BIT NO.
D6
D7
CONTROL REGISTER 1
BIT NO.
D1, D0
D2
CR0
CR1
000
001
TRANSMIT
PATTERN
MODUL.
OPTION
D7
D7
1
Modulation
Test Mode
Option
NAME
NAME
Reset
TRANSMIT
PATTERN
D6
0
(continued)
D6
0
TRANSMIT
MODE 3
D7
D5
X
0
1
CONDITION
CONDITION
DETECT
ENABLE
INTER.
D1
0
0
1
1
D5
D5
0
1
1
0
0
1
D0
TRANSMIT
0
1
0
1
MODE 2
D4
X
1
1
D4
SCRAMB/
BYPASS
PH. EQ.
ADD
D4
10
DESCRIPTION
Selects normal operating mode.
Analog loopback mode. Loops the transmitted analog
signal back to the receiver, and causes the receiver to
use the same center frequency as the transmitter. To
squelch the TXA pin, transmit enable must be forced low.
Not supported in FDX202 mode.
Selects remote digital loopback. Received data is looped
back to transmit data internally, and RXD is forced to a
mark. Data on TXD is ignored.
Selects local digital loopback. Internally loops TXD back
to RXD and continues to transmit carrier from TXA pin.
Selects normal operation.
Resets modem to power down state. All control
register bits (CR0, CR1, Tone) are reset to zero. The
output of the CLK pin will be set to the crystal frequency.
DESCRIPTION
Not used; must be written as a “0.”
Selects:
DPSK asynchronous mode at 1200 bit/s.
FSK Bell 103 mode.
FSK Bell 202 mode.
TRANSMIT
MODE 1
D3
CONTROL
CLK
D3
TRANSMIT
MODE 0
D2
RESET
D2
TRANSMIT
ENABLE
MODE
D1
TEST
D1
1
ORIGINATE
ANSWER/
MODE
TEST
D0
D0
0