Holtek BC68F2130 Manual page 98

Bit 2~0 D2~D0: Reserved bits
Note: It is recommended that the register content should be kept as POR value.
• RF_VCO1 Register – RF VCO Control Register 1
Bit
Name VCO_SWHB
R/W R/W
POR
Bit 7 VCO_SWHB: VCO 2.5GHz frequency band switch control
0: Other frequency bands
1: 315MHz Band
This bit is used to select the VCO 315MHz frequency band. If this bit is set to 1,
the VCO 315MHz is selected. Other VCO frequency bands except 315MHz will be
selected when this bit is set to 0.
Bit 6~0 D6~D0: Frequency Band control
Note that different setting values should be written into this register for different RF frequency band
applications. The recommended setting values are summarized in the following.
RF Frequency Band
RF_VCO1 Setting Values
• RF_VCO2 Register – RF VCO Control Register 2
Bit 7
Name DFCSF
R/W R
POR 0
DFCSF: DFC select failure flag – read only
Bit 7
This bit status is updated after the VCO calibration has completed. If the calibration
result exceeds the DFC curve design range, this bit will be set high to indicate that no
DFC is found in the current selected channel. If the DFC has failed, it means the VCO
can not operate at the desired frequency or there may be other abnormalies.
Bit 6 Unimplemented, read as "0"
Bit 5~1 VCO_DFC4~ VCO_DFC0: VCO DFC curve trim value
00000: Minimum frequency
11111: Maximum frequency
These bits are used to set the various capacitor array values corresponding to different
frequency bands to increase the VCO frequency covering range. The larger the field
value is set, the higher VCO frequency is obtained. The VCO DFC trim value in this
bit field can be determined by the software manual setting or hardware auto calibration
fitting selected by the DFC_OW bit.
Bit 0 DFC_OW: VCO DFC curve trim value source selection
0: VCO DFC curve trim value is determined by auto calibration result
1: VCO DFC curve trim value is determined by manual setting
This bit is used to select the VCO DFC curve trim value source. When this bit is set
to 0, the VCO DFC curve trim value will be derived from the auto calibration result
regardless of the VCO_DFC bit field value. However, the VCO DFC curve trim value
will be determined by the VCO_DFC bit field value rather than the auto calibration
result when this bit is set to 1. When this bit is set to 0, the VCO_DFC bit field will
return the auto calibration result for the VCO DFC curve trim value if a VCO_DFC
field read operation is executed.
Note: It is recommended that the register content should be kept as POR value.
Rev. 1.50
BC68F2130/BC68F2140/BC68F2150
Sub-1GHz RF Transmitter Flash MCU with OCDS
7 6 5
D6 D5
R/W R/W
0 0 0
315MHz
90H
6 5 4
— VCO_DFC4 VCO_DFC3 VCO_DFC2 VCO_DFC1 VCO_DFC0 DFC_OW
— R/W R/W
— 1 0
↓ : ↓
98
4 3 2
D4 D3 D2
R/W R/W R/W
1 0 0
433MHz 868/915MHz
10H 10H
3 2
R/W R/W
0 0
1 0
D1 D0
R/W R/W
0 0
1 0
R/W R/W
0 0
January, 22, 2021