User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 551 of 909 2019 Ambiq Micro, Inc.
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12.4.2.3 ALMLOW Register
RTC Alarms Lower
OFFSET: 0x00000048
INSTANCE 0 ADDRESS: 0x40004248
Table 800: CTRUP Register
3
1
3
0
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1
9
1
8
1
7
1
6
1
5
1
4
1
3
1
2
1
1
1
0
0
9
0
8
0
7
0
6
0
5
0
4
0
3
0
2
0
1
0
0
CTERR
RSVD
CEB
CB
CTRWKDY
CTRYR RSVD CTRMO
RSVD
CTRDATE
Table 801: CTRUP Register Bits
Bit Name Reset RW Description
31 CTERR 0x0 RO
Counter read error status. Error is triggered when software reads the lower
word of the counters, and fails to read the upper counter within 1/100 sec-
ond. This is because when the lower counter is read, the upper counter is
held off from incrementing until it is read so that the full time stamp can be
read.
NOERR = 0x0 - No read error occurred
RDERR = 0x1 - Read error occurred
30:29 RSVD 0x0 RO
RESERVED
28 CEB 0x0 RW
Century enable
DIS = 0x0 - Disable the Century bit from changing
EN = 0x1 - Enable the Century bit to change
27 CB 0x0 RW
Century
2000 = 0x0 - Century is 2000s
1900_2100 = 0x1 - Century is 1900s/2100s
26:24 CTRWKDY 0x0 RW
Weekdays Counter
23:16 CTRYR 0x0 RW
Years Counter
15:13 RSVD 0x0 RO
RESERVED
12:8 CTRMO 0x0 RW
Months Counter
7:6 RSVD 0x0 RO
RESERVED
5:0 CTRDATE 0x0 RW
Date Counter