73k222al ETC-unknow, 73k222al Datasheet - Page 11

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

CONTROL REGISTER 1
CR1
001
BIT NO.
D4
D5
D7, D6
DETECT REGISTER
BIT NO.
D0
D1
010
DR
TRANSMIT
PATTERN
D7
D7
1
X
Call Progress
Long Loop
Scrambler
Transmit
Bypass
Pattern
Enable
NAME
Detect
NAME
Detect
TRANSMIT
PATTERN
(continued)
D6
D6
0
X
RECEIVE
DETECT
CONDITION
ENABLE
CONDITION
INTER.
DATA
D7
D5
0
0
1
1
D5
0
1
0
1
0
1
0
1
D6
0
1
0
1
SCRAMB
UNSCR.
BYPASS
MARK
D4
D4
11
DESCRIPTION
Selects normal operation. DPSK data is passed through
scrambler.
Selects Scrambler Bypass. Bypass DPSK data is routed
around scrambler in the transmit path.
Disables interrupt at INT pin.
Enables INT output. An interrupts will be generated with
a change in status of DR bits D1-D4. The answer tone
and call progress detect interrupts are masked when the
TX enable bit is set. Carrier detect is masked when TX
DTMF is activated. All interrupts will be disabled if the
device is in power down mode.
Selects normal data transmission as controlled by the
state of the TXD pin.
Selects an alternating mark/space transmit pattern for
modem testing.
Selects a constant mark transmit pattern.
Selects a constant space transmit pattern.
DESCRIPTION
Indicates normal received signal.
Indicates low received signal level.
No call progress tone detected.
Indicates presence of call progress tones. The call
progress detection circuitry is activated by energy in the
350 to 620 Hz call progress band.
CONTROL
DETECT
CARR.
V.22, V.21, Bell 212A, 103
CLK
D3
D3
Single-Chip Modem
ANSWER
RESET
TONE
D2
D2
PROG.
MODE
CALL
73K222AL
TEST
D1
D1
1
LONG
MODE
LOOP
TEST
D0
D0
0