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MX828DS Datasheet PDF : 34 Pages
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CTCSS/DCS/SelCall Processor
10
4.4 Write Only Register Description
MX828 PRELIMINARY INFORMATION
4.4.1 GENERAL RESET (Hex address $01)
The reset command has no data attached to it. It sets the device registers into the specific (all powersaved) states as
listed below:
REGISTER NAME
SIGNALING CONTROL
HEX
ADDRESS
$80
BIT 7
(D7)
0
BIT 6
(D6)
0
BIT 5
(D5)
0
BIT 4
(D4)
0
BIT 3
(D3)
0
SELCALL & SUB-AUDIO STATUS
$81
0
0
0
0
X
SIGNALING SET-UP
$82
0
0
0
0
0
CTCSS TX / FAST RX FREQUENCY (1)
$83
0
0
0
0
0
CTCSS TX / FAST RX FREQUENCY (2)
0
0
0
0
0
RX TONE PROGRAM
(1)
$84
0
0
0
0
0
RX TONE PROGRAM
(2)
0
0
0
0
0
DCS BYTE 3
$85
0
0
0
0
0
DCS BYTE 2
DCS BYTE 1
$86
0
0
0
0
0
$87
0
0
0
0
0
GENERAL CONTROL
$88
0
0
0
0
0
AUDIO CONTROL
(1)
$8A
0
0
0
0
0
AUDIO CONTROL
(2)
0
0
0
0
0
GENERAL PURPOSE TIMER
$8B
0
0
0
0
0
SELCALL TX
(1)
$8D
0
0
0
0
0
SELCALL TX
(2)
0
0
0
0
0
IRQ MASK
$8E
0
0
0
0
0
IRQ FLAG
$8F
0
0
0
0
0
X = undefined
Table 6: GENERAL RESET (Hex address $01)
BIT 2
(D2)
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BIT 1
(D1)
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
BIT 0
D0)
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4.4.2 SIGNALING CONTROL Register (Hex address $80)
This register is used to control the functions of the device as described below:
SUBAUDIO TX
ENABLE
(Bit 7)
TONE DECODER
ENABLE
(Bit 6)
CTCSS FAST DETECT
ENABLE
(Bit 5)
SELCALL TX
ENABLE
(Bit 2)
Bit 7 should be set to “1” to enable the CTCSS/DCS subaudio transmitter. The
subaudio Tx type will depend on the state of the SUBAUDIO TX MODE (Bit 1
SIGNALING SET-UP Register $82).
Bit 6 should be set to “1” to enable the CTCSS/SelCall tone decoder or the DCS
decoder. Note: See Bit 0 for DCS decoder operation.
Bits 7 and 6 should not both be set to “1” when Bit 0 is set to “1” because the DCS
function is half-duplex only.
When this bit is "1", the FAST CTCSS DETECT or FAST CTCSS PREDICTIVE mode
is enabled, depending upon the setting of FAST CTCSS MODE (Bit 3 SIGNALING
SET-UP Register, $82). When this bit is "0", both FAST CTCSS DETECT and FAST
CTCSS PREDICTIVE tone detectors are disabled.
When this bit is "1" the SelCall transmitter is enabled. When this bit is "0" the SelCall
transmitter is disabled and powersaved.
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480161.002
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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