Baseband Signal Processor
FX829
DTMFEN
(Bit 6)
When this bit is "1", the DTMF output is enabled.
When this bit is "0", the DTMF output is disabled. As the powersave of the DTMF
is performed in the DTMFHI and DTMFLO registers, this bit allows a fast start up
time for the tones.
Note:
1.
The DTMF Encoder and FFSK Tx cannot both be enabled at the same time.
If both DTMFEN and FFSKTX are "1", then they will both be disabled.
DTMFHI
(Bit 5)
When this bit is "1", the DTMF high frequency tone generator is enabled. It will not
appear on the output pin unless or until the DTMFEN is "1".
When this bit is "0", the DTMF high frequency tone generator is disabled (i.e.
powersaved).
DTMFLO
(Bit 4)
When this bit is "1", the DTMF low frequency tone generator is enabled. It will not
appear on the output pin unless or until the DTMFEN is "1".
When this bit is "0", the DTMF low frequency tone generator is disabled (i.e.
powersaved).
DTMF3, DTMF2,
DTMF1, DTMF0
(Bit 3, Bit 2,
These four bits define the DTMF tones according to the table below:
Bit 1, Bit 0)
Bit
3
Bit
2
Bit
1
Bit
0
DTMF
Tones
DTMF
'Digit'
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1209Hz + 697Hz
1209Hz + 770Hz
1209Hz + 852Hz
1209Hz + 941Hz
1337Hz + 697Hz
1337Hz + 770Hz
1337Hz + 852Hz
1337Hz + 941Hz
1478Hz + 697Hz
1478Hz + 770Hz
1478Hz + 852Hz
1478Hz + 941Hz
1634Hz + 697Hz
1634Hz + 770Hz
1634Hz + 852Hz
1634Hz + 941Hz
1
4
7
*
2
5
8
0
3
6
9
#
A
B
C
D
ã 1997 Consumer Microcircuits Limited
13
D/829/4
CMLMICRO [ CML MICROCIRCUITS ]
