Sub-Audio Signaling Processor
Page 2 of 24
MX805A
Contents
Section
Page
1 Block Diagram............................................................................................................... 4
2 Signal List...................................................................................................................... 5
3 External Components................................................................................................... 7
3.1 Input configurations............................................................................................................ 8
3.1.1 Using and External Op-Amp...................................................................................................... 8
4 General Description...................................................................................................... 9
4.1 Glossary ............................................................................................................................ 9
4.2 Operating Modes ............................................................................................................... 9
4.2.1 NRZ Encoding ........................................................................................................................... 9
4.2.2 CTCSS Encoding ...................................................................................................................... 9
4.2.3 NRZ Decoding......................................................................................................................... 10
4.2.4 CTCSS Decoding .................................................................................................................... 10
5 Controlling Protocol ................................................................................................... 10
5.1 MX805A Internal Registers .............................................................................................. 10
5.1.1 Control Register (70 /78 )..................................................................................................... 10
H
H
5.1.2 Status Register (71 /79 ) ...................................................................................................... 10
H
H
5.1.3 CTCSS Rx Frequency Register (72 /7A ) ............................................................................ 10
H
H
5.1.4 CTCSS Tx Frequency/NRZ Tx or Rx Baud Rate Register (73 /7B ) ................................... 10
H
H
5.1.5 NRZ Rx Data Register (74 /7C ) .......................................................................................... 10
H
H
5.1.6 NRZ Tx Data Register (75 /7D )........................................................................................... 10
H
H
5.1.7 Gain Set Register (76 /7E ).................................................................................................. 10
H
H
5.2 Address/Commands ........................................................................................................ 11
5.2.1 Write to Control Register - A/C 70H (78H) followed by 1 byte of Command Data.................. 12
5.2.2 General Reset ......................................................................................................................... 12
5.2.3 Read Status Register –A/C 71 (79 ) followed by 1 byte of Rely Data. ............................... 13
H
H
5.2.4 Read CTCSS RX Frequency Register –A/C 72 (7A ) followed by 2 bytes of Reply Data .. 13
H
H
5.2.5 Write to CTCSS TX Frequency/NRZ Baud Data Rate Register –A/C 73 (7B ) followed
H
H
by 2 bytes of Command Data.................................................................................................. 15
5.2.6 Read NRZ RX Data Register – A/C 74 (7C ) followed by 1 byte Reply Data..................... 17
H
H
5.2.7 Write to NRZ TX Data Register – A/C 75 (7D ) followed by 1 byte of Command Data. ..... 17
H
H
5.2.8 Write to Gain Set Register – A/C 76 (7E ) followed by 1 byte of Command Data.............. 17
H
H
ã2001 MX-COM, Inc.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480116.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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