73m2921 ETC-unknow, 73m2921 Datasheet - Page 21

• Manufacturer Part Number: 73m2921
• Description: Advanced Single Chip Modem
• Manufacturer: ETC-unknow

DTMF DETECT REGISTER
BIT NO.
D3, D2, D1, D0
February 99 Rev M
Det. Valid
D4, D5, D6
D7
BIT D7
BIT D6
RES.
Reserved
Detect 3-0
DTMF
Detect
NAME
DTMF
Valid
BIT D5
RES.
ADDRESS: 04h (04d, 00100b)
D3
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
CONDITION
D2
BIT D4
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
RES.
TDK Semiconductor
1
0
D1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
D0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
DTDET
BIT D3
3
Reserved for future use
Indicates a valid DTMF detection
Indicates no detect for polled applications
DIGIT
C
D
A
B
1
2
3
4
5
6
7
8
9
0
#
*
MODE: CALL PROGRESS
DTDET
BIT D2
DESCRIPTION
Detects 697 Hz & 1209 Hz
Detects 697 Hz & 1336 Hz
Detects 697 Hz & 1477 Hz
Detects 770 Hz & 1209 Hz
Detects 770 Hz & 1336 Hz
Detects 770 Hz & 1477 Hz
Detects 852 Hz & 1209 Hz
Detects 852 Hz & 1336 Hz
Detects 852 Hz & 1477 Hz
Detects 941 Hz & 1336 Hz
Detects 941 Hz & 1209 Hz
Detects 941 Hz & 1477 Hz
Detects 697 Hz & 1633 Hz
Detects 770 Hz & 1633 Hz
Detects 852 Hz & 1633 Hz
Detects 941 Hz & 1633 Hz
2
Advanced Single
DTDET
BIT D1
Chip Modem
1
73M2921
Page 21 of 41
DTDET
BIT D0
0