FX805LG View Datasheet(PDF) - CML Microsystems Plc
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FX805LG Datasheet PDF : 17 Pages
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Controlling Protocol ......
“Write to CTCSS Tx Frequency/NRZ Baud Rate Register” ......
Command Word ‘Q’
With reference to Figure 7, Bits 0 to 10 are used to produce the data word ‘Q’ which sets one of the parameters described
below. As can be seen, command word ‘Q’ could be used to produce a word whose value would produce a parameter outside
that specified, care should be taken not to do this. Examples for limits of ‘Q’ in each operational configuration are included. ‘Q’
= 0 is not valid in the following calculations. Bit 11 is not used and must be set to logic “0”.
(a) CTCSS Tx Tone Frequency (f
)
CTCSS OUT
f
=
f
Hz
CTCSS OUT
XTAL
32 x ‘Q’
so ‘Q’ =
f
Hz
XTAL
32 x fCTCSS OUT
Example Limits
f
=
CTCSS OUT
so ‘Q’
=
f
=
CTCSS OUT
so ‘Q’
=
67Hz
1866
250Hz
500
“11101001010”
“00111110100”
(b) NRZ Tx Baud Rate (R )
NRZ Tx
R
=
NRZ Tx
f
XTAL
32 x ‘Q’
so ‘Q’ =
f
XTAL
32 x RNRZ Tx
bits/sec
(c) NRZ Rx Baud Rate (R )
NRZ Rx
R
=
NRZ Rx
f
XTAL
32 x 11 x ‘Q’
so ‘Q’
=
f
XTAL
352 x R
NRZ Rx
bits/sec
R
NRZ Tx
so ‘Q’
R
NRZ Tx
so ‘Q’
= 67 bits/sec
=
1866
“11101001010”
= 300 bits/sec
=
417
“00110100001”
R
NRZ Rx
so ‘Q’
RNRZ Rx
so ‘Q’
= 100 bits/sec
=
114
“00001110010”
= 300 bits/sec
=
38
“00000100110”
11
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