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ISDB-T 1-Segment Tuner
Table 4. VAS Register
BIT NAME
X
BIT LOCATION
(0 = LSB)
7
DEFAULT
1
FUNCTION
Factory use only. Must be programmed to 1 upon power-up.
Controls the VCO autoselect (VAS) start conditions function.
VASS
6
0
0 = VAS starts from the current VCO/VCOSB loaded in the VCO[1:0]
and VSB[3:0] registers.
1 = VAS starts from the currently used VCO and VCOSB.
Controls the VCO autoselect (VAS) function.
VAS
5
1
0 = Disables the VCO autoselect function and allows manual VCO selection
through the VCO[1:0] and VSB[3:0] bits.
1 = Enables the on-chip VCO autoselect state machine.
Sets the charge-pump current selection mode between automatic and manual.
CPS
4
1
0 = Charge-pump current is set manually through the CP[1:0] bits.
1 = Charge-pump current is automatically selected. Also requires ADE, ADL,
and VAS bits to be programmed to 1.
Enables or disables the VCO tuning voltage ADC latch.
ADL
3
0
0 = Disables the ADC latch.
1 = Latches the ADC value.
Enables or disables VCO tuning voltage ADC.
ADE
2
0
0 = Disables ADC read.
1 = Enables ADC read.
Sets the VCO autoselect wait time.
00 = 14336/f XTAL .
LTC[1:0]
1, 0
11
01 = 24576/f XTAL .
10 = 34816/f XTAL .
11 = 45056/f XTAL .
Table 5. VCO Register
BIT NAME
X
BIT LOCATION
(0 = LSB)
7
DEFAULT
0
FUNCTION
Factory use only. Must be programmed to 0 upon power-up.
Controls which VCO band is activated when using manual VCO programming
mode. This also serves as the starting point for VCO autoselect mode when
VASS = 0.
VCO[1:0]
6, 5
01
00 = Select VCO-0.
01 = Select VCO-1.
10 = Select VCO-2.
11 = Not used.
12
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