C8051F99X_10 Datasheet, PDF (210/322 Pages) Silicon Laboratories – Ultra Low Power, 8-2 kB Flash, Capacitive Sensing MCU

C8051F99x-C8051F98x
Internal Register Definition 20.5. RTC0XCN: SmaRTClock Oscillator Control
Bit
7
6
5
4
3
2
1
0
Name AGCEN XMODE BIASX2 CLKVLD LFOEN
Type ^R/W
R/W
R/W
R
R
R
R
R
Reset
0
0
0
0
0
0
0
0
SmaRTClock Address = 0x05
Bit Name
Function
7 AGCEN SmaRTClock Oscillator Automatic Gain Control (AGC) Enable.
0: AGC disabled.
1: AGC enabled.
6 XMODE SmaRTClock Oscillator Mode.
Selects Crystal or Self Oscillate Mode.
0: Self-Oscillate Mode selected.
1: Crystal Mode selected.
5 BIASX2 SmaRTClock Oscillator Bias Double Enable.
Enables/disables the Bias Double feature.
0: Bias Double disabled.
1: Bias Double enabled.
4 CLKVLD SmaRTClock 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 (LFO) as the
SmaRTClock oscillator source.
0: XMODE determines SmaRTClock oscillator source.
1: LFO enabled and selected as SmaRTClock oscillator source.
2:0 Unused Read = 000b; Write = Don’t Care.
210
Rev. 1.0