FX829 Просмотр технического описания (PDF) - CML Microsystems Plc

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FX829

Baseband Signal Processor

CML Microsystems Plc 

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,

Bit 1, Bit 0)

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

Bit

Bit

Bit

Bit

3

2

1

0

DTMF

Tones

DTMF

'Digit'

0

0

0

0

1209Hz + 697Hz

1

0

0

0

1

1209Hz + 770Hz

4

0

0

1

0

1209Hz + 852Hz

7

0

0

1

1

1209Hz + 941Hz

*

0

1

0

0

1337Hz + 697Hz

2

0

1

0

1

1337Hz + 770Hz

5

0

1

1

0

1337Hz + 852Hz

8

0

1

1

1

1337Hz + 941Hz

0

1

0

0

0

1478Hz + 697Hz

3

1

0

0

1

1478Hz + 770Hz

6

1

0

1

0

1478Hz + 852Hz

9

1

0

1

1

1478Hz + 941Hz

#

1

1

0

0

1634Hz + 697Hz

A

1

1

0

1

1634Hz + 770Hz

B

1

1

1

0

1634Hz + 852Hz

C

1

1

1

1

1634Hz + 941Hz

D

© 1997 Consumer Microcircuits Limited

13

D/829/4

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