73K302L
Bell 212A, 103, 202
Single-Chip Modem
REGISTER ADDRESS TABLE
ADDRESS
DATA BIT NUMBER
REGISTER
AD2 - AD0
D7
D6
0
D5
D4
D3
D2
D1
D0
CONTROL
TRANSMIT
MODE
3
TRANSMIT
MODE
2
TRANSMIT
MODE
1
TRANSMIT
MODE
0
MODULATION
OPTION
TRANSMIT
ENABLE
ORIGINATE/
ANSWER
REGISTER CR0
0
000
IN 212, 103 MODES:
0=ANSWER
0=103 FSK
1=202 FSK
0000=PWR DOWN
0=DISABLE
TXA OUTPUT
1=ENABLE
1100=FSK
1=ORIGINATE
0010=EXT SYNCH
0011=SLAVE SYNCH
0100=ASYNCH 8 BITS/CHAR
0101=ASYNCH 9 BITS/CHAR
0110=ASYNCH 10 BITS/CHAR
0111=ASYNCH 11 BITS/CHAR
1100=FSK BELL 103 OR 202
TXA OUTPUT
IN 202 MODE:
0=RECEIVE @ 1200 BIT/S,
TRANSMIT @ 150 BIT/S
1=RECEIVE @ 150 BIT/S,
TRANSMIT @ 1200 BIT/S
TRANSMIT
PATTERN
1
TRANSMIT
PATTERN
0
BYPASS
CONTROL
ENABLE
DETECT
TEST
MODE
1
TEST
MODE
0
CLK
CR1
001
SCRAMBLER/
ADD PH. EQ.
RESET
REGISTER
1
CONTROL
INTERRUPT
00=TX DATA
0=DISABLE
1=ENABLE
0=NORMAL
1=BYPASS
0=XTAL
0=NORMAL
1=RESET
00=NORMAL
01=TX ALTERNATE
10=TX MARK
1=16 X DATA
01=ANALOG LOOPBACK
10=REMOTE DIGITAL
LOOPBACK
SCRAMBLER RATE OUTPUT
11=TX SPACE
1=ADD EXTRA
PHASE EQ.
IN 202 ONLY
AT CLK PIN IN
DPSK MODE
ONLY
11=LOCAL DIGITAL
LOOPBACK
DETECT
UNSCR.
MARK
CARRIER
DETECT
SPECIAL
TONE
RECEIVE
DATA
CALL
PROGRESS
LONG
LOOP
DR
TR
010
011
X
X
REGISTER
OUTPUTS
0=CONDITION NOT DETECTED
1=CONDITION DETECTED
RECEIVED
DATA STREAM
TONE
RXD
TRANSMIT
SCT
TRANSMIT
ANSWER
TONE
DTMF2/
DTMF1/
202T
DTMF0/
SPECIAL
TONE
TRANSMIT
DTMF
CONTROL
REGISTER
OUTPUT
CONTROL
DTMF3
OVERSPEED
FDX
TONE
0=DATA
RXD PIN
0=NORMAL
1=TRI STATE
0=OFF
1=ON
4 BIT CODE FOR 1 OF 16
0=OFF
1=ON
0=900 HZ SCT TONE IF
IN ANSWER MODE
=2225 HZ ANSWER TONE
IN 103 OR 212 ORIGINATE
MODES
1=TX DTMF
DUAL TONE COMBINATIONS.
0=1%
1=2.5%
0=NORMAL
1=FULL DUPLEX IN 202 MODE
1=FSK MARK
ID
10
110
ID
ID
ID
ID
X
X
X
X
REGISTER
00XX=73K212AL, 322L, 321L
01XX=73K221AL, 302L
10XX=73K222AL, 222BL
1100=73K224L
X = Undefined, mask in software
0 = Only write zeros to this location
1110=73K324L
1100=73K224BL
1110=73K324BL
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