C8051F970-A-GM Datasheet, PDF (267/454 Pages) Silicon Laboratories – Low Power Capacitive Sensing MCU with up to 32 kB of Flash

C8051F97x
Register 25.4. RTC0XCN: RTC Oscillator Control
Bit
7
6
Name AGCEN XMODE
Type
RW
RW
Reset
0
0
Indirect Address: 0x05
5
BIASX2
RW
0
4
CLKVLD
R
0
3
LFOEN
R
0
2
1
0
Reserved
R
0
0
0
Bit
Name
Function
7
AGCEN RTC Oscillator Automatic Gain Control (AGC) Enable.
0: Disable AGC.
1: Enable AGC.
6
XMODE RTC Oscillator Mode.
Selects Crystal or Self Oscillate Mode.
0: Self-Oscillate Mode selected.
1: Crystal Mode selected.
5
BIASX2 RTC Oscillator Bias Double Enable.
Enables/disables the Bias Double feature.
0: Disable the Bias Double feature.
1: Enable the Bias Double feature.
4
CLKVLD RTC Oscillator Crystal Valid Indicator.
Indicates if oscillation amplitude is sufficient for maintaining oscillation.
0: Oscillation has not started or oscillation amplitude is too low to maintain oscillation.
1: Sufficient oscillation amplitude detected.
3
LFOEN Low Frequency Oscillator Enable and Select.
Overrides XMODE and selects the internal low frequency oscillator (LFOSC) as the RTC
oscillator source.
0: XMODE determines RTC oscillator source.
1: LFOSC enabled and selected as RTC oscillator source.
2:0
Reserved Must write reset value.
268
Rev 1.0