CMX808AP4 Ver la hoja de datos (PDF) - MX-COM Inc
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CMX808AP4 Datasheet PDF : 22 Pages
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Family Radio Service CTCSS Processor
8
CMX808A Preliminary Information
4.1.2.2 SUB-AUDIO CONTROL Register (Hex address $80)
This register is used to control the functions of the device as described below:
CTCSS TX ENABLE
and DECODER
ENABLE
(Bits 7 and 6)
CTCSS DECODER
BANDWIDTH
(Bits 5, 4, 3 and 2)
(Bit 1)
CTCSS IRQ MASK
(Bit 0)
These two bits enable and disable the CTCSS decoder (Rx) or transmitter (Tx)
according to Table 6.
These four bits set the bandwidth of the CTCSS tone decoder according to Table 7.
Reserved for future use. This bit should be set to "0".
When this bit is set to "1" it enables the interrupt.
When this bit is set to "0" the interrupt is masked.
Table 5: SUB-AUDIO CONTROL Register (Hex address $80)
Tx (Bit 7)
0
0
1
1
Rx (Bit 6)
0
1
0
1
Function
Tx disabled, Rx disabled
Tx disabled, Rx enabled
Tx enabled, Rx disabled
Tx enabled, Rx enabled
Table 6: CTCSS TX ENABLE and DECODER ENABLE
BANDWIDTH
Bit Bit Bit Bit Will Decode Will Not Decode
5
4
3
2
1
0
0
0
±1.1%
±2.4%
1
0
0
1
±1.3%
±2.7%
1
0
1
0
±1.6%
±2.9%
1
0
1
1
±1.8%
±3.2%
1
1
0
0
±2.0%
±3.5%
1
1
0
1
±2.2%
±3.7%
1
1
1
0
±2.5%
±4.0%
1
1
1
1
±2.7%
±4.2%
Table 7: CTCSS DECODER
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480199.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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