CMX868E2 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX868E2' PDF : 43 Pages View PDF
Low Power V.22bis Modem
Rx DTMF bursts
Status Register bit 5
Status Register bits 3-0
Status Register bit 15 (IRQ)
IRQ output
28
A
CMX868 Advance Information
B
Code for burst A
Note 1
Note 2
Code for burst B
Notes: 1. IRQ will go high only if the IRQ Mask bit b0 in the General Control Register is set.
The IRQ bit is cleared by a read of the Status Register.
2. IRQ output will go low when IRQ bit high if IRQEN bit of General Control Register is set
Figure 18: Operation of Status Register in DTMF Rx Mode
b3 b2 b1 b0
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Low frequency (Hz)
941
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
High frequency (Hz)
1633
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
Keypad symbol
D
1
2
3
4
5
6
7
8
9
0
*
#
A
B
C
Table 6: Received DTMF Code: b3-0 of Status Register
¤2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480205.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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