73K222AL-IGT 데이터 시트보기 (PDF) - TDK Corporation
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73K222AL-IGT Datasheet PDF : 28 Pages
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73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip Modem
CONTROL REGISTER 1 (continued)
CR1
001
D7
TRANSMIT
PATTERN
1
D6
TRANSMIT
PATTERN
0
BIT NO.
NAME
D4
Bypass
Scrambler
D5
Enable
Detect
D7, D6
Transmit
Pattern
D5
D4
D3
D2
D1
D0
ENABLE
DETECT
INTER.
BYPASS
CLK
SCRAMB CONTROL
RESET
TEST
MODE
1
TEST
MODE
0
CONDITION DESCRIPTION
0
Selects normal operation. DPSK data is passed through
scrambler.
1
Selects Scrambler Bypass. Bypass DPSK data is routed
around scrambler in the transmit path.
0
Disables interrupt at INT pin.
1
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.
D7 D6
00
Selects normal data transmission as controlled by the
state of the TXD pin.
01
Selects an alternating mark/space transmit pattern for
modem testing.
10
Selects a constant mark transmit pattern.
11
Selects a constant space transmit pattern.
DETECT REGISTER
D7
D6
DR
010
X
X
BIT NO.
D0
NAME
Long Loop
D1
Call Progress
Detect
D5
D4
D3
D2
D1
D0
RECEIVE
DATA
UNSCR.
MARK
CARR. ANSWER
DETECT TONE
CALL
PROG.
LONG
LOOP
CONDITION
DESCRIPTION
0
Indicates normal received signal.
1
Indicates low received signal level.
0
No call progress tone detected.
1
Indicates presence of call progress tones. The call
progress detection circuitry is activated by energy in the
350 to 620 Hz call progress band.
11
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