CMX138 CML Microcircuits, CMX138 Datasheet - Page 59

• Manufacturer Part Number: CMX138
• Description: Audio Scrambler and Sub-Audio Signalling Processor
• Manufacturer: CML Microcircuits

Audio Scrambler and Sub-Audio Signalling Processor
CMX138
10 Application Notes
10.1 Script files for use with the PE0001
10.1.1 Rx mode:
// 138 Rx mode
//int mask
w16 ce 0000
// mode reg
w16 c1 0000
//power down - enable Rx DISCin -> AUDIOout
w16 c0 b440
//input gain = 0dB, select DISXCin
w16 b0 0002
//output gain = 0dB
w16 b1 e000
//setup Output mode
w16 a7 3000
//audio mode
w16 c2 3400
//mode ctrl - audio on, In-band mode on, CTCSS on, Rx
w16 c1 4241
10.1.2 Tx mode:
// 138 Tx mode, send In-band tone, ctcss then back to voice mode
// mode reg
w16 c1 0000
//power down - enable Tx MICin -> MODout
w16 c0 6940
//int mask
w16 ce 0000
//input gain = 0dB
w16 b0 0003
//output gain = 0dB
w16 b1 1c00
//setup Output mode
w16 a7 3000
//voice mode - 12.5kHz filter, pre-emph, hpf, ctcss=151Hz
w16 c2 34e0
//mode ctrl – In-band tone (1750Hz) on, CTCSS on, Tx
w16 c1 0242
//tone control - select In-band tone
w16 c3 8000
© 2008 CML Microsystems Plc
Page 59
D/138_FI1.0/5