73K222AL
V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
CONTROL REGISTER 1 (continued)
D7
D6
D5
D4
D3
D2
D1
D0
CR1
001
TRANSMIT
PATTERN
1
TRANSMIT
PATTERN
0
ENABLE
DETECT
INTER.
BYPASS
SCRAMB
CLK
RESET
TEST
MODE
1
TEST
MODE
0
CONTROL
BIT NO.
NAME
CONDITION
DESCRIPTION
D4
Bypass
0
Selects normal operation. DPSK data is passed through
Scrambler
scrambler.
1
Selects Scrambler Bypass. Bypass DPSK data is routed
around scrambler in the transmit path.
D5
Enable
Detect
0
1
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.
D7, D6
Transmit
Pattern
D7 D6
Selects normal data transmission as controlled by the
state of the TXD pin.
0
0
0
1
Selects an alternating mark/space transmit pattern for
modem testing.
1
1
0
1
Selects a constant mark transmit pattern.
Selects a constant space transmit pattern.
DETECT REGISTER
D7
X
D6
X
D5
RECEIVE
DATA
D4
UNSCR.
MARK
D3
D2
ANSWER
TONE
D1
D0
LONG
LOOP
DR
CARR.
CALL
010
DETECT
PROG.
BIT NO.
NAME
CONDITION
DESCRIPTION
D0
Long Loop
0
1
0
1
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.
D1
Call Progress
Detect
Page: 11 of 27
© 2007 TERIDIAN Semiconductor Corporation
Rev 6.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
