CMX624 데이터 시트보기 (PDF) - MX-COM Inc

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CMX624

Bell 202 and V.23 Modem with Call Progress and DTMF

MX-COM Inc  

Bell 202 and V.23 Compatible Modem

11

4.9.2 Bell 202 mode (Bit 7 of SETUP register = ‘1’):

CMX624 Preliminary Information

FSK MODE

Reg

Bit 1 Bit 0

0

x

1

0

1

1

FSK / DTMF Modulator block output

(Bit 7 of TX TONES = ‘0’)

Disabled (output held at VDD/2)

150bps FSK

1200bps FSK

FSK Signal Frequency

‘0’ (Space) ‘1’ (Mark)

487Hz

2200Hz

387Hz

1200Hz

Table 7: Bell 202 mode (Bit 7 of SETUP register = ‘1’)

When Bit 7 of the TX TONES Register is set to ‘1’, the block generates DTMF tone pairs or single tones from

the DTMF range as shown in Table 8. Bit 6 of the TX TONES Register is then used to enable or disable the

block’s output to the Tx filter.

TX DATA Register

Bits 0 - 3

D3 D2 D1 D0

0000

0001

0010

0011

0100

0101

0110

0111

1000

1001

1010

1011

1100

1101

1110

1111

TX TONES Register

DTMF Tone Pairs

(Bit 4 = ‘0’)

Lower

Upper

Keypad

Frequency (Hz) Frequency (Hz) Legend

941

1633

D

697

1209

1

697

1336

2

697

1477

3

770

1209

4

770

1336

5

770

1477

6

852

1209

7

852

1336

8

852

1477

9

941

1336

0

941

1209

*

941

1477

#

697

1633

A

770

1633

B

852

1633

C

Single Tone

(Bit 4 = ‘1’)

Single Tone

Frequency (Hz)

1633

1209

1336

1477

1209

1336

1477

1209

852

852

941

941

941

697

770

852

Table 8: DTMF Transmitting settings

©1999 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480180.108

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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