Toshiba TC9349AFG Manual page 118

IF Counter
This is a 20-bit general-purpose counter that counts the intermediate frequency (IF) of FM or AM during auto tuning and
can be used to detect auto stop signals. It can also measure the VCO of the analog tuner and detect the received frequency.
4. IF Counter Control Ports and Data Ports
IF counter control 1
Y1 Y2
φ L16(0)
NC IFin
Note: When the input port setting is selected, frequency detection can be carried out by CMOS input to the IF
counter.
Note: When the IF input setting is selected, the IF input amplifier turns off when in the PLL off mode. To use
the IF counter in the PLL off mode, select the input port setting (CMOS input).
Note: When the counter input is set to the prescaler input, the 1/15･16 prescaler is fixed to 16 frequency
divisions in the pulse swallow method and this frequency is inputted to the IF counter.
Note: For the input frequency range when the prescaler input setting is selected, refer to the section on
Programmable counter.
Note: Set the Y8 bit of the IF control 1 port ( φ L16 (0)) to "0".
IF counter control 2
Y1 Y2
φ L16(1)
MANUAL
STA/ STP
Y1 Y2
φ L16(F)
TA0 TA1
φΚ 11(F)
PLL amplifier setting register
Note: In the PLL amplifier setting register, the TA0 and TA1 bits are used for setting the OSCin input amplifier,
and the TA2 and TA3 bits are used for setting the IFin input amplifier.
Y4 Y8
Prescaller
0
IN
Setting of OSCin pre-scaler input to IF counter
Selection between IF input
and input port
Setting of IF input nose cancel circuit
0: Invalid
1: Valid (Noise cancel operation)
Y4 Y8
G0 G1
Selection of automatic or manual frequency measurement
0: Auto mode (Take measurements during the gate time listed above)
1: Manual mode (Start and stop measurements according to the
STA/ STP
IF counter start/stop control bit
0: Counter stop
1: Counter start
Y4 Y8
TA2 TA3
Set all "1" (FH)
118
0: Input port (IN) setting
1: IF input setting
Selection of gate time for frequency measurement
(Measurement time)
G1 G0
Gate time
0 0 1 ms
0 1 4 ms
1 0 16 ms
1 1 64 ms
bit.)
TC9349AFG
0: IFin pin input setting
1: OSCin pin input setting
IF input operating frequency range
0.35 MHz to 12 MHz
0.03 MHz to 1 MHz
2006-02-24