CTCSS/DCS/SelCall Processor
10
MX828 PRELIMINARY INFORMATION
4.4 Write Only Register Description
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
HEX
ADDRESS
BIT 7
(D7)
BIT 6
(D6)
BIT 5
(D5)
BIT 4
(D4)
BIT 3
(D3)
BIT 2
(D2)
BIT 1
(D1)
BIT 0
D0)
SIGNALING CONTROL
$80
$81
$82
$83
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SELCALL & SUB-AUDIO STATUS
SIGNALING SET-UP
CTCSS TX / FAST RX FREQUENCY (1)
CTCSS TX / FAST RX FREQUENCY (2)
RX TONE PROGRAM
RX TONE PROGRAM
DCS BYTE 3
(1)
(2)
$84
$85
$86
$87
$88
$8A
DCS BYTE 2
DCS BYTE 1
GENERAL CONTROL
AUDIO CONTROL
AUDIO CONTROL
GENERAL PURPOSE TIMER
SELCALL TX
(1)
(2)
$8B
$8D
(1)
(2)
SELCALL TX
IRQ MASK
$8E
$8F
IRQ FLAG
X = undefined
Table 6: GENERAL RESET (Hex address $01)
4.4.2 SIGNALING CONTROL Register (Hex address $80)
This register is used to control the functions of the device as described below:
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).
SUBAUDIO TX
ENABLE
(Bit 7)
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.
TONE DECODER
ENABLE
(Bit 6)
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.
CTCSS FAST DETECT
ENABLE
(Bit 5)
When this bit is "1" the SelCall transmitter is enabled. When this bit is "0" the SelCall
transmitter is disabled and powersaved.
SELCALL TX
ENABLE
(Bit 2)
© 1997 MX•COM Inc.
www.mxcom.com Tele: 800 638-5577 336 744-5050 Fax: 336 744-5054
Doc. # 20480161.002
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