73K302L TDK [TDK Electronics], 73K302L Datasheet - Page 7

• Manufacturer Part Number: 73K302L
• Description: Single-Chip Modem
• Manufacturer: TDK [TDK Electronics]

REGISTER DESCRIPTIONS
Four 8-bit internal registers are accessible for control
and status monitoring. The registers are accessed in
read or write operations by addressing the A0 and
A1 address lines in serial mode, or the AD0 and
AD1 lines in parallel mode. The AD0 and AD1 lines
are latched by ALE. Register CR0 controls the
method by which data is transferred over the phone
line. CR1 controls the interface between the
REGISTER BIT SUMMARY
NOTE: When a register containing reserved
REGISTER
CONTROL
REGISTER
CONTROL
REGISTER
REGISTER
CONTROL
REGISTER
DETECT
TONE
REGISTER
ID
0
1
control bits is written into, the reserved bits
must be programmed as 0's.
X = Undefined, mask in software.
CR0
CR1
DR
TR
ID
AD2 - AD0
ADDRESS
000
001
010
011
110
MODULATION
TRANSMIT
CONTROL
PATTERN
OUTPUT
OPTION
RXD
D7
1
X
ID
TRANSMIT
TRANSMIT
PATTERN
TONE
SCT
D6
0
0
X
ID
INTERRUPT
TRANSMIT
TRANSMIT
ANSWER
ENABLE
DETECT
RECEIVE
MODE
DATA
TONE
D5
3
ID
7
SCRAMBLER/
ADD PH. EQ.
TRANSMIT
TRANSMIT
BYPASS
UNSCR.
MARKS
microprocessor and the 73K302L internal state. DR
is a detect register which provides an indication of
monitored modem status conditions. TR, the tone
control register, controls the DTMF generator,
answer and guard tones and RXD output gate used
in the modem initial connect sequence. All registers
are read/write except for DR which is read only.
Register control and status bits are identified below:
MODE
DTMF
202
DATA BIT NUMBER
D4
2
ID
TRANSMIT
CONTROL
CARRIER
DETECT
DTMF3
MODE
CLK
D3
1
X
Single-Chip Modem
Bell 212A, 103, 202
TRANSMIT
SPECIAL
RESET
MODE
DTMF/
TONE
202T
FDX
D2
0
X
PROGRESS
OVERSPEED
TRANSMIT
ENABLE
DTMF1/
CALL
MODE
TEST
D1
1
X
ANSWER TONE/
SPEC. TONE/
ORIGINATE
ANSWER/
SELECT
DTMF0/
MODE
LONG
LOOP
TEST
D0
0
X