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參數(shù)資料
| 型號： | FX818 |
| 元件分類： | Codec |
| 英文描述： | CTCSS Super Codec |
| 中文描述： | 超級亞音頻編解碼器 |
| 文件頁數(shù)： | 12/26頁 |
| 文件大?。?/td> | 676K |
| 代理商： | FX818 |
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CTCSS Signalling Processor
FX818
1997
Consumer Microcircuits Limited
12
D/818/4
When Bit 7 (in the first 8 bits) is set to "1" the tone output is set at V
BIAS
or NOTONE without regard to the
number "A" programmed. When Bit 7 is "0" the programmed tone is set on the output. Programming the bits 0
to 12 to "0" puts the Tx into powersave and the output goes to V
BIAS
. Powersave is also achieved by disabling
the Tx and the FAST DETECT.
CTCSS RX PROGRAM Register (Hex address $84)
This is a 16-bit register. Byte (1) is sent first. The two bytes are used to program the centre frequencies of up
to 15 tones in the sub-audio band that will be decoded by the receiver.
Each tone is identified by its address in bits 7, 6, 5 and 4 of byte (1). The remaining 12 bits contain the data
representing the tone frequency according to the formula below. If a tone is not required the 12 bits should be
set to zero.
Byte 1
Bit
3
<-------------------- N -------------------- >
Byte 2
Bit
4
Bit
7
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
Bit
6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
Bit
5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
Bit
4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Bit
2
Bit
1
Bit
0
Bit
7
Bit
6
Bit
5
Bit
3
Bit
2
Bit
1
Bit
0
<-------------------- R ------------------->
N is the binary representation of the
following decimal number (n):
R is the nearest 6-bit binary
representation of (r), where:
n = INT (948982 x f
TONE
/ f
XTAL
)
r = ((237245/f
XTAL
) - (n/(4 x f
TONE
))) x 8400
Example: To program 100Hz when using the recommended 4.032MHz Xtal.
n =
INT (948982 x 100 / 4.032 x 10^6)
INT (23.536) = 23
010111 (binary)
=
N =
r
=
=
((237245 / 4.032 x 10^6) - (23 / (4 x 100))) x 8400
11.26 (round up if exactly halfway)
R =
11
001011 (binary)
=
Thus the 12-bit code is 010111001011
The Hex address represented by bits 7, 6, 5 and 4 in byte (1) is used as the code to indicate which tone has
been decoded. This code appears in bits 3, 2, 1 and 0 of the SUB-AUDIO STATUS Register (Hex address
$81). The 15 programmed tones use Hex addresses $0 - $E.
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| FX836 | R2000 System Audio Processor |
| FX836DW | Telecommunication IC |
| FX836J | Telecommunication IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FX818D2 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:CTCSS SIGNALLING PROCESSOR |
| FX826 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:AMPS/TACS System Audio Processor |
| FX826DW | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:AMPS / TACS SYSTEM AUDIO PROCESSOR |
| FX826J | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:AMPS/TACS System Audio Processor |
| FX828 | 制造商:CMLMICRO 制造商全稱:CML Microcircuits 功能描述:CTCSS/DCS/SELCALL Processor |
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