MX803ALH Ver la hoja de datos (PDF) - MX-COM Inc
Número de pieza
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Fabricante
MX803ALH Datasheet PDF : 26 Pages
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Audio Signaling Processor
16
MX803A PRELIMINARY INFORMATION
The NOTONE Timer Period Expired bit is cleared:
1. By a read of the Status Register.
2. New NOTONE Timer Information
3. General Reset Command
The timer is set to 00H by a General Reset command.
Setting
Function / Period
MSB
7
6 54
Transmitted Bit 7 first
0
0 00
these 4 bits must be 0
period (ms)
3
2 10
High Band
%
Mid Band
%
0
0 00
0
0
0
0 01
20
±1
40
±1
0
0 10
40
±1
80
±1
0
0 11
60
±1
120
±1
0
1 00
80
±1
160
±1
0
1 01
100
±1
200
±1
0
1 10
120
±1
240
±1
0
1 11
140
±1
280
±1
1
0 00
160
±1
320
±1
1
0 01
280
±1
360
±1
1
0 10
200
±1
400
±1
1
0 11
220
±1
440
±1
1
1 00
240
±1
480
±1
1
1 01
260
±1
520
±1
1
1 10
280
±1
560
±1
1
1 11
300
±1
600
±1
Table 6: RX Notone Timer Settings
5.2.6.2 NOTONE TIMER CIRCUITRY
The following situations may be encountered by the Notone Timer Circuitry
5.2.6.2.1 No Signal
The Notone timer can only start its run down on completion of a valid frequency measurement.
5.2.6.2.2 No signal after a valid Tone measurement
The timer will start to run down when the last RX Tone Measurement complete bit is set. At the end of the “primed” period
the NOTONE Timer Period Expired bit in the Status Register and the Interrupt will be set.
5.2.6.2.3 Signal fades after a valid Tone measurement
The timer will start to run down when the signal becomes unreadable to the device. At the end of the “primed” period the
NOTONE Timer Period Expired bit in the Status Register and the Interrupt will be set.
5.2.6.2.4 Signal appears after the Timer has started
If the frequency measurement is more than 75% complete when the timer period expires, neither the NOTONE bit nor the
Interrupt will be set unless that frequency measurement is subsequently aborted.
© 1996 MX•COM, INC.
Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054
Doc. # 20480122.003
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