FX828D2 CMLMICRO [CML Microcircuits], FX828D2 Datasheet - Page 16

• Manufacturer Part Number: FX828D2
• Description: CTCSS/DCS/SELCALL Processor
• Manufacturer: CMLMICRO [CML Microcircuits]

CTCSS/DCS/SELCALL Processor
where A is the binary number programmed into the 13 bits.
When Bit 7 (in the first 8 bits) is set to "1" the tone output is set at V
number "A" programmed. When Bit 7 is "0" the programmed tone is set on the output. Programming the
bits 0 to 12 to "0" puts the Tx into powersave and the output goes to V
by disabling the SELCALL Tx.
8-bit Read Only Registers
Read Only Register Description
SELCALL and SUB-AUDIO STATUS Register (Hex address $81)
This register is used to indicate the status of the device as described below:
DCS DECODE/NO
DECODE
(Bit 7)
CTCSS FAST TONE
(Bit 6)
(Bit 5)
TONE DECODE
(Bit 4)
© 2009 CML Microsystems Plc
COMMAND
ADDRESS/
HEX
$8F
$81
SELCALL &
SUB-AUDIO
REGISTER
IRQ FLAG
STATUS
NAME
A
NO DECODE
When the DCS decoder is enabled this bit is continuously updated with the
result.
indicates a failure to decode.
When Bit 5 in the SIGNALLING CONTROL Register and Bit 3 in the
SIGNALLING SET-UP Register are set to enable FAST CTCSS DETECT mode,
this bit will be set to "1" if a periodic tone is detected. If no periodic tone is
detected this bit will be "0".
When bits 5 and 3 are set to enable FAST CTCSS PREDICTIVE mode, this bit
will be set to "1" if a periodic tone that matches the frequency programmed in
the CTCSS TX/FAST RX FREQUENCY Register is detected. If no match is
found this bit will be "0".
When Bit 5 in the SIGNALLING CONTROL Register is set to "0" this bit will be
"0".
Reserved for future use. This will be set to "0" but should be ignored by the
user's software.
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).
=
DECODE/
BIT 7
DCS
4 x f
(D7)
0
f
XTAL
TONE
A "1" indicates a successful decode (with 3 or less errors).
(Hz)
GP TIMER
(Hz)
CTCSS
TONE
FAST
FLAG
BIT 6
(D6)
IRQ
IRQ FLAG
COMP
BIT 5
0 to 1
(D5)
0
16
IRQ FLAG
DECODE
COMP
TONE
1 to 0
BIT 4
(D4)
BIAS
TONE
FLAG
BIT 3
BIT 3
MSB
(D3)
IRQ
BIAS
or NOTONE without regard to the
. Powersave is also achieved
CTCSS FAST
FLAG
BIT 2
BIT 2
(D2)
IRQ
RX TONE
BIT 1
BIT 1
(D1)
0
D/828/4
FX828
A "0"
FLAG
BIT 0
BIT 0
DCS
(D0)
LSB
IRQ