Maxim Integrated MAX32660 - Page 104

MAX32660 User Guide
Maxim Integrated Page 104 of 195
RTC Oscillator Control Register
RTC_OSCCTRL
[0x18]
Bits
Name
Access
Reset
Description
4
bypass
R/W
0
RTC Crystal Bypass
Bypass the crystal oscillator to allow a digital square wave to be driven on the 32KIN
pin.
0: Disable bypass (POR default)
1: Enable bypass
Note: This field is only reset on POR and not effected by other forms of reset.
3
ibias_en
R/W
1
RTC Oscillator Bias Current Enable
Enables 4× or 2× bias current selected by RTC_OSCCTRL.ibias_sel in noise immunity
mode
0: Disable
1: Enable (POR default)
Note: This field is only reset on POR and not effected by other forms of reset.
2
hyst_en
R/W
0
RTC Oscillator Hysteresis Buffer Enable
Enables the RTC hysteresis buffer in noise immunity mode. This increases DC current
consumption by ~144nA.
0: Disable (POR default)
1: Enable
Note: This field is only reset on POR and not effected by other forms of reset.
1
ibias_sel
R/W
0
RTC Oscillator 4× Bias Current Select
0: selects 2× bias current for RTC oscillator (POR default).
1: selects 4× bias current for RTC oscillator.
Note: This field is only reset on POR and not effected by other forms of reset.
0
filter_en
R/W
1
RTC Oscillator Filter Enable
0: Disable RTC oscillator filter
1: Enable RTC oscillator filter (POR default)
Note: This field is only reset on POR and not effected by other forms of reset.