73k222al ETC-unknow, 73k222al Datasheet - Page 10

• Manufacturer Part Number: 73k222al
• Description: V.22, V.21, Bell 212a, Single-chip Modem
• Manufacturer: ETC-unknow

73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip
CONTROL REGISTER 0
BIT NO.
D7
CONTROL REGISTER 1
BIT NO.
D1, D0
D2
D3
CR0
CR1
000
001
TRANSMIT
MODUL.
OPTION
PATTERN
D7
D7
1
(Clock Control)
CLK Control
Modulation
Test Mode
NAME
Option
NAME
Reset
D6
TRANSMIT
PATTERN
0
(continued)
D6
0
TRANSMIT
MODE 3
D5
D7
0
1
0
1
DETECT
CONDITION
ENABLE
CONDITION
INTER.
D1
0
0
1
1
D5
D5
0
0
1
1
TRANSMIT
0
1
0
1
MODE 2
D0
0
1
0
1
D4
D4
X
X
1
1
SCRAMB
BYPASS
D4
10
DESCRIPTION
Selects:
DPSK mode at 1200 bit/s.
DPSK mode at 600 bit/s.
FSK Bell 103 mode.
FSK CCITT V.21 mode.
X = Don’t care
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.
Selects 11.0592 MHz crystal echo output at CLK pin.
Selects 16 X the data rate, output at CLK pin in DPSK
modes only.
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