參數(shù)資料
型號(hào)： FX818
元件分類： Codec
英文描述： CTCSS Super Codec
中文描述： 超級(jí)亞音頻編解碼器
文件頁(yè)數(shù)： 19/26頁(yè)
文件大?。?/td> 676K
代理商： FX818
CTCSS Signalling Processor
FX818
1997
Consumer Microcircuits Limited
19
D/818/4
1.6.4
This is used for detecting, in the fastest possible time, that sub-audio tones are present on the Rx channel.
Response time is optimised for speed at the expense of frequency resolution.
Receiver (Fast/Predictive Detector)
It can operate in parallel to the Rx decoder. It is enabled using Bit 5 of the "SUB-AUDIO CONTROL" register
($80). It has an IRQ which may be unmasked with Bit 2 of the "IRQ MASK" register ($8E). The "FAST
CTCSS MODE DETECT/PREDICTIVE" Bit 3 in the "SUB-AUDIO SET UP" register ($82) allows for one of two
alternatives in the FAST mode. In DETECT mode it will detect any periodic tone in the sub-audio band and
when in PREDICTIVE mode it will detect specific tones determined by the frequency set in the "CTCSS
TX/FAST RX" register ($83) and the fixed PREDICTIVE mode bandwidth. Successful detection is indicated by
the CTCSS FAST IRQ FLAG Bit 2 in the IRQ FLAG register ($8F), and the CTCSS FAST TONE Bit 6 in the
SUB-AUDIO STATUS register ($81).
1.6.5
This may be used in conjunction with the Rx Decoder to form part of the decode algorithm or as a timer for any
other purpose. It has an 8-bit value register "GENERAL PURPOSE TIMER" register ($8B) set in units of
1msec, an IRQ FLAG Bit 6 of the "IRQ FLAG" register ($8F) and an IRQ MASK Bit 6 "IRQ MASK" register
($8E).
General Purpose Timer (GPT)
1.6.6
The following table lists the commonly used CTCSS tones and the corresponding values for programming the
transmitter frequency / fast predictive frequency register (Hex address $83).
Tx / Fast Rx Tone Table
Freq.
(Hz)
67.0
69.3
71.9
74.4
77.0
79.7
82.5
85.4
88.5
91.5
94.8
97.4
100.0
103.5
107.2
110.9
Byte 1
(hex)
E
E
D
D
C
C
B
B
B
A
A
A
9
9
9
8
Byte 2
(hex)
B1
34
B1
3B
C9
5A
EF
87
1F
C2
62
1B
D8
83
2F
E0
Freq.
(Hz)
114.8
118.8
123.0
127.3
131.8
136.5
141.3
146.2
151.4
156.7
159.8
162.2
167.9
173.8
179.9
183.5
Byte 1
(hex)
8
8
8
7
7
7
6
6
6
6
6
6
5
5
5
5
Byte 2
(hex)
93
49
1
BC
78
36
F7
BC
80
48
29
12
DD
AA
79
5D
Freq.
(Hz)
186.2
189.9
192.8
196.6
199.5
203.5
206.5
210.7
218.1
225.7
229.1
233.6
241.8
250.3
254.1
Byte 1
(hex)
5
5
5
5
4
4
4
4
4
4
4
4
4
3
3
Byte 2
(hex)
49
2F
1B
2
EF
D6
C4
AC
83
5D
4C
37
12
EF
E0
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