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CMX838 View Datasheet(PDF) - MX-COM Inc

Part Name
Description
MFG CO.
'CMX838' PDF : 70 Pages View PDF
FRS/PMR446/GMRS Family Radio Processor
24
CMX838 Advance Information
4.2.4.3.3 Adjust Detector Band Width (Task 6)
The default bandwidth can be increased or decreased in increments of approximately 0.2% by loading a small
positive or negative (2’s complement) value in register $8E and then issuing task 6. For the standard TIA tone
set the default BW setting is recommended – so there is no need to adjust it. By default, the detector has a
small BW hysteresis to minimize chatter in marginal conditions.
4.2.4.3.4 Adjust No Tone Timer Duration (Task 7)
The default no tone timer duration can be increased or decreased in increments of 60µs by loading a positive
or negative (2’s complement) value in register $8E and then issuing task 7.
Argument = INT (0.5 + 16.667 TimerDelta)
Where TimerDelta is the amount by which you want to increase or decrease the Default No Tone Timer in
milliseconds.
For example, to increase the default no tone timer by 10ms, load 167 (0xA7) into register $8E before issuing
task 7.
$8E 0x00A7
$93 0x67
// Task 7 command to adjust no tone timer with IRQ’s enabled
4.2.4.4 TX Configuration
4.2.4.4.1 Select Sub-Audio Tone From Preprogrammed List (Task 8)
To select a preprogrammed sub-audio tone, load the index argument (1 to 50) in register $95 then issue
task 8.
For example to set up TX tone to 114.8 Hz, the required C-BUS sequence would be
$95 0x11
$95 0x48
4.2.4.4.2 Program User Defined TX Sub-Audio Tone (Task 9)
To program a user defined sub-audio tone, load the argument in register $8E then issue task 9. Where the
argument is defined by,
Argument = INT ¨§0.5 + 36 65536 f ¸·
©
100000 ¹
For example to set up TX tone to 65 Hz, the required C-BUS sequence would be
$8E 0x05FE
$93 0x49
4.2.4.4.3 Program Audio Frequency Ringing Tone (Task 10)
To program a user-defined audio ringing tone, load the argument in register $8E then issue task 10. Where
the argument is defined by,
Argument = INT ¨§0.5 + 6 65536 f ¸·
©
100000 ¹
For example to set up the ringing tone frequency to 620 Hz, the required C-BUS sequence would be
$8E 0x0986
$93 0x4A
4.2.4.4.4 Program TX Timer (Task 11)
Load the argument in register $8E, then issue task 11. Where the argument is defined by, TBD.
4.2.4.5 Initialize and Configure
4.2.4.5.1 Enter Fast Initialization Mode (Task 12)
Issuing task 12 takes the tone signaling processor out of normal running mode and dedicates the processor to
handling initialization tasks to increase the maximum task rate. In this mode neither the tone encoders nor the
decoders run. To return to normal running mode issue task 0. In this fast initialization mode tasks can be
issued at a rate of one per 50µs. Ensure that the required argument registers are not updated for at least this
time after a task is issued.
¤2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480221.002
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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