73K324BL
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
CONTROL REGISTER 1
D7 D6
CR0 MODUL. MODUL. MODUL. TRANSMIT TRANSMIT TRANSMIT TRANSMIT
D5
D4
D3
D2
D1
D0
ANSWER/
000 OPTION TYPE 1
TYPE 0
CONDITION
D1 D0
MODE 2
MODE 1
DESCRIPTION
MODE 0
ENABLE
ORIGINATE
BIT
NAME
D0, D1
Test Mode
0
0
0
1
Selects normal operating mode.
Analog loopback mode. Loops the transmitted analog
signal back to the receiver, and causes the receiver to
use the same carrier frequency as the transmitter. To
squelch the TXA pin, transmit enable bit as well as Tone
Register bit D2 must be low.
1
1
0
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.
1
Selects local digital loopback. Internally loops TXD back
to RXD and continues to transmit data carrier at TXA pin
D2
Reset
0
1
Selects Normal Operations
Resets modem to power-down state. All Control
Register bits (CR0, CR1, CR2, CR3 and tone) are reset
to zero except CR3 bit D2. The output of the clock pin
will be set to the crystal frequency.
D3
D4
Clock Control
0
1
Selects 11.0592 MHz crystal echo output at CLK pin.
Selects 16 times the data rate output at CLK pin in
DPSK/QAM modes only.
Bypass
Scrambler
0
1
Selects normal operation. DPSK and QAM data is
passed through scrambler.
Selects Scrambler bypass. Bypass DPSK and QAM
data is route around scrambler in the transmit path.
D5
Enable Detect
Interrupt
0
1
Disables interrupt at INT pin. All interrupts are normally
disabled in power-down mode.
Enables INT output. An interrupt will be generated with a
change in status of DR bits D1- D4 and D6. The answer
tone and call progress detect interrupts are masked
when the TX enable bit is set. Carrier detect is masked
when TXDTMF is activated. All interrupts will be disable
if the device is in power-down mode.
D7 D6
D6, D7
Transmit
Pattern
0
0
Selects normal data transmission as controlled by the
state of the TXD pin.
0
1
Selects an alternating mar/space transmit pattern for
modem testing and handshaking. Also used for S1
pattern generation (see CR2 bit D4).
1
1
0
1
Selects a constant mark transmit pattern.
Selects a constant space transmit pattern.
Page: 13 of 34
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 6.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
