STV8203 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STV8203' PDF : 31 Pages View PDF
STV8203
PROGRAMMING THE DEVICE (continued)
IAGCS (Internal AGC Control Value)
Address
Type
: 16
:R
bit 7
bit 6
bit 5
bit 4
bit 3
IAGC-CTRL
bit 2
bit 1
bit 0
Indicates the value of the internal AGC control signal.
Normally, the mean value should equal the value set in the IAGCR register when a signal is being
demodulated.
FFFIXL (Clock Generator Fine frequency)
Address
Type
Reset
: 17
: R/W
: 0000 0000
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
CLOCK GENERATOR FINE FREQUENCY (8 LSB’s)
bit 1
bit 0
See FCFIX register for explanation.
FFFIXH (Clock Generator and Fine Frequency Control)
Address
Type
Reset
: 18
: R/W
: 0110 1110
bit 7
0
bit 6
bit 5
bit 4
DEMOD MODE M2:M0
bit 3
bit 2
bit 1
bit 0
CLOCK GEN FINE FREQ (4 MSB’s)
DEMOD MODE M2:M0 : Controls the demodulator mode (only when register Ehex bits[3:0] = 0000) :
MODE[6:4]
CH1 FM
CH2 FM/QPSK
X00
Normal
FM Normal
X01
Wide
FM Wide
010
Normal
QPSK System B/G/L
011
Wide
QPSK System B/G/L
110
Normal
QPSK System I
111
Wide
QPSK System I
The FM discriminator modulation full range can be set at :
- narrow mode : 250kHz (± 125kHz),
- wide mode : 500kHz (± 250kHz).
CLOCK GEN FINE FREQ : Clock generator fine frequency (4 MSB’s) ( see FCFIX for explanation).
FCFIX (Clock Generator Coarse Frequency)
Address
Type
Reset
: 19
: R/W
: 0001 0001
bit 7
0
bit 6
0
bit 5
bit 4
bit 3
bit 2
bit 1
CLOCK GENERATOR COARSE FREQUENCY
bit 0
The bits [5:0] together with FFFIXH bits [3:0] and FFFIXL bits [7:0] can be used to programme the internal
clock generator for different quartz crystal frequencies ; the default value is for 27MHz.
P
=
182
⋅
Fref
Fqpsk
−
193
with Fref = crystal frequency, Fqpsk = 32 x 728kHz = 23.296MHz.
FCFIX = INT(P)
(INT: integer part)
FFFIX = 256 x (16 x REM(P) - 1) (REM: fractional remainder)
Note that 0 ≤ FFFIX <3840 so there is a small range of frequencies which cannot be used.
Example : Fref = 27MHz, FCFIX = 17, FFFIX = 3584.
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