CMX808AE3 Просмотр технического описания (PDF) - MX-COM Inc
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CMX808AE3 Datasheet PDF : 22 Pages
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Family Radio Service CTCSS Processor
7
CMX808A Preliminary Information
4 General Description
The CMX808A is a programmable CTCSS Processor for Family Radio Service, 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.
4.1 Software Description
4.1.1 Address/Commands
Instructions and data are transferred, via "C-BUS", in accordance with the timing information given in Figure
6.
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)
4.1.2 Write Only Register Description
HEX
ADDRESS/
COMMAND
$01
$80
$82
REGISTER
NAME
GENERAL
RESET
SUB-AUDIO
CONTROL
AUDIO
CONTROL
BIT 7
(D7)
BIT 6
(D6)
BIT 5
(D5)
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
BIT 1
(D1)
N/A
N/A
N/A
N/A
N/A
N/A
N/A
CTCSS
TX
DECODER
ENABLE ENABLE
TX BPF RX BPF
ENABLE ENABLE
CTCSS DECODER BANDWIDTH
MSB
LSB
0
BIT 3 BIT 2 BIT 1 BIT 0
BPF
UN-
MUTE
MSB
BIT 4
AUDIO ATTENUATION
BIT 3 BIT 2 BIT 1
BIT 0
(D0)
N/A
CTCSS
IRQ
MASK
LSB
BIT 0
Table 3: 8-bit Write Only Registers
HEX ADDRESS/
COMMAND
$83
$84
REGISTER
NAME
CTCSS
TX FREQ.
(Byte 1)
CTCSS
TX FREQ.
(Byte 2)
CTCSS RX
PROGRAM
(Byte 1)
CTCSS RX
PROGRAM
(Byte 2)
BIT 7
(D7)
CTCSS
TX
NOTONE
BIT 7
0
BIT 7
BIT 6
(D6)
BIT 5
(D5)
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
BIT 1
(D1)
BIT 0
(D0)
CTCSS TX FREQUENCY
0
0
MSB
BIT 12 BIT 11 BIT 10 BIT 9 BIT 8
CTCSS TX FREQUENCY
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
LSB
BIT 0
CTCSS TONE ADDRESS
CTCSS FREQUENCY
MSB
BIT2
BIT 1
LSB
BIT 0
MSB
BIT 11 BIT 10
BIT 9
BIT 8
CTCSS FREQUENCY
BIT6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
LSB
BIT 0
Table 4: 16-bit Write Only Registers
4.1.2.1 GENERAL RESET (Hex address $01)
The reset command has no data attached to it. It sets the device registers to zero (all powersaved) with the
exception of Bits 2, 1 and 0 of the SUB-AUDIO STATUS register $81.
©1999 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480199.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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