Maxim Integrated MAX32665 - Table 18-7. RTC Time-Of-Day Alarm Register; Table 18-8. RTC Sub-Second Alarm Register; Table 18-9. RTC Control Register

MAX32665-MAX32668 User Guide
Maxim Integrated Page 377 of 457
Table 18-7. RTC Time-of-Day Alarm Register
RTC Time-of-Day Alarm
RTC_TODA
[0x0008]
Bits
Field
Access
Reset
Description
31:20
-
R/W
0
Reserved for Future Use
Do not modify this field.
19:0
tod_alarm
R/W
0
Time-of-Day Alarm
Sets the time-of-day alarm from 1 second up to 12-days. When this field matches
RTC_SEC[19:0], an RTC system interrupt is generated.
Table 18-8. RTC Sub-Second Alarm Register
RTC Sub-Second Alarm
RTC_SSECA
[0x000C]
Bits
Field
Access
Reset
Description
31:0
ssec_alarm
R/W
0
Sub-second Alarm (4KHz)
Sets the starting and reload value of the internal sub-second alarm counter. The
internal counter increments and generates an alarm when the internal counter rolls
from 0xFFFF FFFF to 0x0000 0000.
Table 18-9. RTC Control Register
RTC Control Register
RTC_CTRL
[0x0010]
Bits
Field
Access
Reset
Description
31:16
-
R/W
0*
Reserved for Future Use
Do not modify this field.
15
write_en
R/W
0*
Write Enable
This field controls access to the RTC_TRIMregister, the RTC enable (RTC_CTRL.enable)
fields.
1: Writes to the RTC_TRIM register and the RTC_CTRL.enable field are allowed.
0: Writes to the RTC_TRIM register and the RTC_CTRL.enable field are ignored.
*Note: Reset on POR only.
14:13
-
R/W
0*
Reserved for Future Use
Do not modify this field.
12:11
-
R/W
0*
Reserved for Future Use
Do not modify this field.
10:9
freq_sel
R/W
0*
Frequency Output Select
Selects the RTC-derived frequency to output on the square wave output pin. See Table
18-3. MAX32665―MAX32668 RTC Square Wave Output Configuration for
configuration details.
0b00: 1Hz (Compensated)
0b01: 512Hz (Compensated)
0b1x: 4kHz
*Note: Reset on POR only.
8
sqwout_en
R/W
0*
Square Wave Output Enable
Enables the square wave output. Table 18-3. MAX32665―MAX32668 RTC Square
Wave Output Configuration
0: Disabled.
1: Enabled.
*Note: Reset on POR only.