CMX808A Ver la hoja de datos (PDF) - CML Microcircuits
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CMX808A Datasheet PDF : 23 Pages
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Family Radio CTCSS 'Type 2' Encoder and Decoder
CMX808A
1.5 General Description
The CMX808A is a programmable CTCSS ‘Type 2’ encoder and decoder for Family Radio, see Figure 1.
The receiver of the CMX808A decodes a user-programmable set of up to 7 tones with minimum software
intervention; the band-pass filter is designed to filter out the CTCSS sub-audio tones. A high resolution tone
encoder performs accurate generation of CTCSS tones.
Each function, and the routing of signals, is flexible and may be configured or controlled by the user's
software.
1.5.1 Software Description
Address/Commands
Instructions and data are transferred, via "C-BUS", in accordance with the timing information given in
Figure 4.
Instruction and data transactions to and from the CMX808A consist of an Address/Command (A/C)
byte which may be followed by either:
(i)
a further instruction or data (1 or 2 bytes) or
(ii) a status or Rx data reply (1 byte)
8-bit Write 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)
$01
GENERAL
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
RESET
CTCSS
CTCSS DECODER BANDWIDTH
CTCSS
$80
SUB-AUDIO
TX
DECODER
MSB
LSB
0
IRQ
CONTROL ENABLE ENABLE
BIT 3
BIT 2 BIT 1
BIT 0
MASK
AUDIO ATTENUATION
$82
AUDIO
TX BPF
RX BPF
BPF
MSB
LSB
CONTROL ENABLE ENABLE UN-MUTE BIT 4 BIT 3
BIT 2
BIT 1
BIT 0
16-bit Write Only Registers
HEX
ADDRESS/
COMMAND
REGISTER
NAME
BIT 7
(D7)
CTCSS
CTCSS
TX FREQ.
TX
$83
(Byte 1) NOTONE
CTCSS
TX FREQ.
(Byte 2)
BIT 7
CTCSS RX
PROGRAM
0
$84
(Byte 1)
CTCSS RX
PROGRAM
(Byte 2)
BIT 7
BIT 6
(D6)
BIT 5
(D5)
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
BIT 1
(D1)
CTCSS TX FREQUENCY
0
0
MSB
BIT 12
BIT 11
BIT 10
BIT 9
CTCSS TX FREQUENCY
BIT 6
BIT 5
BIT 4
BIT 3
CTCSS TONE ADDRESS
MSB
BIT2
BIT 1
LSB
BIT 0
MSB
BIT 11
CTCSS FREQUENCY
BIT 2
BIT 1
CTCSS FREQUENCY
BIT 10
BIT 9
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(D0)
BIT 8
LSB
BIT 0
BIT 8
LSB
BIT 0
© 1999 Consumer Microcircuits Limited
7
D/808A/5
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