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CMX838

FRS/PMR446/GMRS Family Radio Processor

MX-COM Inc  

FRS/PMR446/GMRS Family Radio Processor

3

CMX838 Advance Information

5 Software Programming............................................................................................... 29

5.1 C-BUS Serial Interface..................................................................................................... 29

5.1.1 8-Bit C-BUS Register Map.................................................................................................... 30

5.1.2 16-Bit C-BUS Register Map.................................................................................................. 31

5.1.2.1 GENERAL RESET ($01) ................................................................................................ 31

5.1.2.2 SETUP Register ($80).................................................................................................... 32

5.1.2.3 AUDIO CONTROL Register ($81).................................................................................. 33

5.1.2.4 RX AUDIO LEVEL CONTROL Register ($82) ............................................................... 34

5.1.2.5 AUDIO POWER AND BANDWIDTH CONTROL Register ($83) ................................... 35

5.1.2.6 TXMOD 1 & 2 CONTROL Register ($88)....................................................................... 36

5.1.2.7 SYNTHESIZER BASEBAND CLK CONTROL Register ($89) ....................................... 38

5.1.2.8 SYNTHESIZER GENERAL CONTROL Register ($8A) ................................................. 39

5.1.2.9 SYNTHESIZER CHANNEL SELECT Register ($8B)..................................................... 40

5.1.2.10 SYNTHESIZER STATUS Register ($8C)....................................................................... 40

5.1.2.11 SYNTHESIZER 1ST IF OFFSET Register ($8D)........................................................... 41

5.1.2.12 16 BIT SUBAUDIO TASK DATA Register ($8E)............................................................ 41

5.1.2.13 16 BIT SUBAUDIO TEST DATA Register ($8F) ............................................................ 41

5.1.2.14 SYNTHESIZER TEST Register ($90) ............................................................................ 41

5.1.2.15 16 BIT SUBAUDIO TEST READ DATA Register ($91) ................................................. 42

5.1.2.16 SUBAUDIO PROCESSOR GENERAL CONTROL Register ($93)................................ 42

5.1.2.17 SUBAUDIO STATUS Register ($94).............................................................................. 43

5.1.2.18 SUBAUDIO TASK 8 BIT DATA Register ($95) .............................................................. 43

5.1.2.19 SUBAUDIO ANALOG CONTROL Register ($97) .......................................................... 44

6 Application Notes........................................................................................................ 46

6.1 Overview.......................................................................................................................... 46

6.2 Basic FRS Radio Architecture.......................................................................................... 47

6.3 CMX838 Architectural Overview ...................................................................................... 48

6.4 Detailed CMX838 Architecture......................................................................................... 48

6.4.1 Audio Processing .................................................................................................................. 49

6.4.2 Tone Signaling Processor..................................................................................................... 51

6.4.3 Level Control......................................................................................................................... 53

6.4.4 Synthesizer and Charge Pump............................................................................................. 55

6.4.5 Clock Generation .................................................................................................................. 55

6.4.6 Powersave Functions ........................................................................................................... 56

6.5 Control Registers Illustrated............................................................................................. 56

6.6 Application Examples....................................................................................................... 58

6.6.1 CMX838 Initialization ............................................................................................................ 58

6.6.1.1 Register Descriptions: .................................................................................................... 58

6.6.2 TX, subaudio encoding, single point modulation .................................................................. 59

6.6.2.1 Register Descriptions: .................................................................................................... 59

6.6.3 RX, subaudio decode CTCSS tone or tones ........................................................................ 61

6.6.3.1 Register Descriptions: .................................................................................................... 61

6.6.4 RX, multiple subaudio tone detect - Tone Cloning™............................................................ 63

6.6.4.1 Register Descriptions: .................................................................................................... 63

¤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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