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CMX808AP4 参数 Datasheet PDF下载

CMX808AP4图片预览
型号: CMX808AP4
PDF下载: 下载PDF文件 查看货源
内容描述: 家庭无线电CTCSS “ 2型”编码器和解码器 [Family Radio CTCSS ‘Type 2’ Encoder and Decoder]
分类和应用: 解码器消费电路商用集成电路光电二极管编码器无线
文件页数/大小: 23 页 / 528 K
品牌: CMLMICRO [ CML MICROCIRCUITS ]
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Family Radio CTCSS 'Type 2' Encoder and Decoder  
CMX808A  
TONE CLONING Register (Hex address $9C)  
This register enables and disables tone cloning as shown below:  
$9C = $01 enables tone cloning.  
$9C = $00 disables tone cloning.  
Figure 4 shows the tone cloning routine.  
8-bit Read Only Registers  
HEX  
ADDRESS/  
COMMAND  
REGISTER  
NAME  
BIT 7  
(D7)  
BIT 6  
(D6)  
BIT 5  
(D5)  
BIT 4  
(D4)  
BIT 3  
(D3)  
BIT 2  
(D2)  
BIT 1  
(D1)  
BIT 0  
(D0)  
CTCSS RX TONE  
BIT 1  
$81  
SUB-AUDIO  
STATUS  
0
0
0
0
TONE  
DECODE  
MSB  
BIT 2  
LSB  
BIT 0  
Read Only Register Description  
SUB-AUDIO STATUS Register (Hex address $81)  
Reading the SUB-AUDIO STATUS register clears the interrupt (IRQN).  
This register is used to indicate the status of the device as described below:  
Reserved for future use. These will be set to "0" but should be ignored by user's  
software.  
(Bits 7, 6, 5 and 4)  
This bit indicates the status of the tone decoder. A "1" indicates a tone has been  
detected (TONE DECODE) and a "0" indicates the loss of the tone (NOTONE).  
TONE DECODE  
(Bit 3)  
TONE DECODE means that a tone has been decoded and its characteristics are  
defined by the bandwidth (see SUB-AUDIO CONTROL register $80, Bits 5, 4, 3  
and 2) and the CTCSS RX TONE number (see SUB-AUDIO STATUS register  
$81, Bits 2, 1 and 0).  
When Bit 6 in the SUB-AUDIO CONTROL register $80 is set to "0" the TONE  
DECODE Bit 3 will be set to "0".  
Identification of a valid tone which is not in the pre-programmed list of up to 7  
tones will cause the decoder to move to the TONE DECODE state with the RX  
TONE address of "111" in Bits 2, 1 and 0; indicating a valid but unrecognised  
tone. Loss of tone will cause the NOTONE timer to be started. If loss of tone  
continues for the duration of the time-out period, then the decoder will move to  
NOTONE state and the identification of pre-programmed tones will start again.  
The time-out period is not user adjustable.  
These three bits hold a Hex number. Numbers $0 to $6 represent the address  
of the CTCSS tone decoded according to the tones programmed in the CTCSS  
RX PROGRAM register $84. The Hex number $7 indicates the presence of any  
tone that is not described by CTCSS DECODER BANDWIDTH (Bits 5, 4, 3 and  
2 in the SUB-AUDIO CONTROL register $80) and CTCSS FREQUENCY (Bits  
11 to 0 in the CTCSS RX PROGRAM register $84).  
CTCSS RX TONE  
(Bits 2, 1 and 0)  
2003 CML Microsystems Plc  
11  
D/808A/6