Toshiba TC9349AFG Manual page 100

2. Setting the Frequency Dividing Method and Gain of The Programmable Counter
Using the HF bit, select the pulse swallow or direct frequency division methods; depending on the received frequency.
The programmable counter is used in combination with the 1-chip tuner with a built-in 1/16 or 1/8 pre-scaler. Usually,
use the tuner to input the local oscillation frequency, which is then inputted to the OSCin input in the MW/LW/SW
wavebands. The tuner local oscillation frequency is divided into 16 or 8 parts and the divided frequency is inputted to the
OSCin input in the FM/TV band mode.
The OSCin input has an input amplifier that allows small-amplitude operation. The input amplifier has the registers
( φ L16(F), φ K11(F)) to adjust the amplifier gain. Set all of these registers to "1" (FH).
Frequency dividing
Mode HF
LF 0
Pulse swallow method
HF 1
Note: The local oscillation input is common to each mode and is inputted to the OSCin pin.
3. Setting the Frequency division number
Set the frequency division number for the programmable counter at P0 to P15 bits in the binary format.
• Pulse swallow method (16 bits)
MSB
P15 P14 P13 P12 P11 P10
15
2
Frequency division setting range (n = 210H~1FFFFH (528~65535))
• Direct frequency division method (12 bits)
MSB
P15 P14 P13 P12 P11 P10
11
2
Frequency division setting range (n = 10H~1FFFH (16~4095))
Note: Set the frequency division value in consideration of the tuner pre-scaler frequency division.
Set the frequency division number by writing it into the MSB bit ( φ L15(D)).
Note:
OSCin operation input
frequency range
method
Direct frequency
0.5~4 MHz
dividing method
1~30 MHz
(1/15･16)
P9 P8 P7
P9 P8 P7
100
Example of
receive band
MW/LW
SW/FM/TV
P6 P5 P4 P3 P2 P1
P6 P5 P4 P3 P2 P1
0
2
don't care
TC9349AFG
Frequency dividing
range
10H~FFFH
(16~4095)
210H~FFFFH
(528～65535)
LSB
P0
0
2
LSB
P0
2006-02-24