FX829P4 datasheet(13/34 Pages) CMLMICRO

13 / 34 page

Baseband Signal Processor

FX829

D/829/4

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:

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,

Bit 1, Bit 0)

These four bits define the DTMF tones according to the table below:

Bit

DTMF

Tones

DTMF

'Digit'

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

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