User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 549 of 909 2019 Ambiq Micro, Inc.
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12.3.7 Weekday Function
The Weekday Counter is simply a 3-bit counter which counts up to 6 and then resets to 0. It is the
responsibility of software to assign particular days of the week to each counter value.
12.4 RTC Registers
Real Time Clock
INSTANCE 0 BASE ADDRESS:0x40004200
12.4.1 Register Memory Map
Table 797: RTC Register Map
Address(s) Register Name Description
0x40004240 CTRLOW RTC Counters Lower
0x40004244 CTRUP RTC Counters Upper
0x40004248 ALMLOW RTC Alarms Lower
0x4000424C ALMUP RTC Alarms Upper
0x40004250 RTCCTL RTC Control Register
0x40004300 INTEN RTC Interrupt Register: Enable
0x40004304 INTSTAT RTC Interrupt Register: Status
0x40004308 INTCLR RTC Interrupt Register: Clear
0x4000430C INTSET RTC Interrupt Register: Set