MX828 查看數據表（PDF） - MX-COM Inc
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MX828 Datasheet PDF : 34 Pages
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CTCSS/DCS/SelCall Processor
11
MX828 PRELIMINARY INFORMATION
DCS RX ENABLE
(Bit 0)
(Bits 4, 3, and 1)
When this bit is "1", the DCS decoder is enabled. When this bit is "0" the DCS
decoder is disabled.
The DCS decoder and the subaudio (CTCSS or DCS) transmitter should not be
enabled at the same time.
Reserved for future use. These bits should be set to "0".
Table 7: SIGNALING CONTROL Register (Hex address $80)
4.4.3 SIGNALING SET-UP Register (Hex address $82)
This register is used to define the signaling parameters, as described below:
TONE DECODER
BANDWIDTH
(Bits 7, 6, 5 and 4)
FAST CTCSS MODE
(Bit 3)
TONE DECODER
MODE
(Bit 2)
SUBAUDIO TX MODE
(Bit 1)
DCS 23/24
(Bit 0)
These four bits set the bandwidth of the CTCSS/SelCall tone decoder according to the
table below:
When CTCSS FAST DETECT ENABLE (Bit 5 SIGNALING CONTROL Register, $80)
is "1", this bit selects the FAST CTCSS DETECT or the FAST CTCSS PREDICTIVE
mode, according to the table below:
If the CTCSS FAST DETECT ENABLE bit is "0" then both modes are deselected.
When this bit is "1" the CTCSS/SelCall tone decoder is set to detect inband (SelCall)
tones. When this bit is "0" the tone decoder is set to detect subaudio (CTCSS) tones.
When this bit is "1" the subaudio transmitter will be set to transmit DCS signals, if
enabled. When this bit is "0" the subaudio transmitter will be set to transmit CTCSS
signals, if enabled.
When this bit is "1" the DCS transmitter and decoder are configured for a 23-bit code.
When this bit is "0" they are configured for a 24-bit code.
Table 8: SIGNALING SET-UP Register (Hex address $82)
Recommended for CTCSS
Recommended for CCIR
Recommended for ZVEI
Bit 7
1
1
1
1
1
1
1
1
Bit 6
0
0
0
0
1
1
1
1
Bit 5
0
0
1
1
0
0
1
1
Bit 4
0
1
0
1
0
1
0
1
BANDWIDTH
Will Decode Will Not Decode
±1.1%
±2.4%
±1.3%
±2.7%
±1.6%
±2.9%
±1.8%
±3.2%
±2.0%
±3.5%
±2.2%
±3.7%
±2.5%
±4.0%
±2.7%
±4.2%
Table 9: TONE DECODER BANDWIDTH
DETECT/PREDICTIVE
Bit 3
0
1
Function
DETECT mode
PREDICTIVE mode
Table 10: FAST CTCSS MODE
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480161.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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