CMX605(1999) 데이터 시트보기 (PDF) - MX-COM Inc
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CMX605 Datasheet PDF : 22 Pages
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Digital Line to POTS Interface
12
CMX605 Preliminary Information
Addr. Register
$DF STATUS
7
FSK Mode:
FSK Tx Data
Underflow
6
FSK Mode:
FSK Tx
Data Ready
Reply Data Byte (Bits 7 – 0)
5
4
3
DTMF Rx: DTMF Rx:
DTMF:
Status
Change
1 = Detected
0 = NoTone
Timer timed
out
Rx Data
(D3)
(MSB)
Table 11: Read Only Registers
2
DTMF:
Rx Data
(D2)
1
DTMF:
Rx Data
(D1)
0
DTMF:
Rx Data
(D0)
(LSB)
Notes:
1. Accessing the RESET Register over the ‘C-BUS’ clears all of the bits in the SETUP, MODE, TX DATA,
TX TONES and STATUS registers. This will initialize the device.
Note that this is a single-byte ‘C-BUS’ transaction consisting solely of the address byte value $01.
2. If any of bits 5, 6 or 7 of the STATUS Register is ‘1’ then the IRQ output will be pulled low.
3. Reading the STATUS Register clears the IRQ output and also clears bit 5 of the STATUS Register, if set.
Bits 6 and 7 of the STATUS Register are cleared on writing to the TX DATA Register.
5 Application
When using the Tone/FSK bit (bit 6) of the MODE Register, each tone starts from VBIAS and returns to VBIAS
before ending:
Tone / FSK:
ENABLE
DISABLE
TONEFSK
VBIAS
Figure 7: Tone Starting and Stopping
When switching between tones in the same column (bits 4 - 7 or bits 0 - 3) of the TX TONES Register, the
transition will be phase continuous. However, switching to the “OFF” state will immediately take the output of
that tone generator to VBIAS.
TONEFSK
VBIAS
TONE 1
TONE 2
TONE = OFF
Figure 8: Tone Changing
TX TONES Register codes which do not have a frequency allocated are indicated by “-“ in the Tone Field
tables. These code values should not be used.
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480195.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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