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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
26
CMX838 Advance Information
4.2.4.5.4 Soft Reset (Task 15)
The tone signaling processor must be fully initialized after the chip is powered up. After powering up, the first
time the tone-signaling processor is enabled, it should be with the task field set to 15. This clears the
configuration memory and reverts to Fast Initialization Mode when any other task is issued. After all desired
initialization is performed, return to normal running mode by issuing task 0.
Power up Sequence
//Power up the Device
// issue general reset
$01
// set up base band clocks before enabling the sub-audio processor
$89 0xXX
// specific setting depends on your system (See Section 5.1.2.7)
$8A 0xXX
// specific setting depends on your system (See Section 5.1.2.8)
// issue Sub-audio processor soft reset
$93 0x4F
// wait for soft reset to complete
wait 250µs
// set up TX sub-audio frequency
$95 TX tone index
$93 0x48
// set up one RX sub-audio frequency
$95 (0x80 | RX tone index)
$93 0x44
// setup normal run mode for sub-audio processor
$93 (0x40 | IRQ control | Task 0)
// setup RX and TX sub-audio analog trimmers to 0dB
$97 0x1010
// setup other C-BUS registers as needed (e.g. Register $80 to select TX/RX , $88 for TX Mod 1 and Mod 2
Control, etc.)
¤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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