73k322l ETC-unknow, 73k322l Datasheet - Page 10

• Manufacturer Part Number: 73k322l
• Description: Ccitt V.23, V.22, V.21 Single-chip Modem
• Manufacturer: ETC-unknow

CCITT V.23, V.22, V.21
Single-Chip Modem
CONTROL REGISTER 0
BIT NO.
D6
D7
CONTROL REGISTER 1
BIT NO.
D1, D0
D2
CR0
CR1
000
001
TRANSMIT
MODUL.
OPTION
PATTERN
D7
D7
1
Modulation
Test Mode
NAME
Option
NAME
Reset
D6
TRANSMIT
PATTERN
(continued)
D6
0
TRANSMIT
MODE 3
D5
ENABLE
DETECT
D7 D5
INTER.
CONDITION
CONDITION
0
1
0
1
D1
D5
0
0
1
1
TRANSMIT
0
0
0
1
1
0
1
MODE 2
D0
0
1
0
1
D4
D4
X
X
1
1
SCRAMB/
BYPASS
PH. EQ.
ADD
D4
10
DESCRIPTION
Not used; must be written as a “0.”
Selects:
PSK Asynchronous mode at 1200 bit/s.
PSK Asynchronous mode at 600 bit/s.
FSK CCITT V.23 mode.
FSK CCITT V.21 mode.
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.
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.
TRANSMIT
MODE 1
D3
CONTROL
CLK
D3
TRANSMIT
MODE 0
D2
RESET
D2
TRANSMIT
ENABLE
D1
MODE
TEST
D1
1
ORIGINATE
ANSWER/
MODE
D0
TEST
D0
0