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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
1097 of 1441
NXP Semiconductors
UM10503
Chapter 37: LPC43xx/LPC43Sxx Real-Time Clock (RTC)
[1]
This register value is not changed by reset.
37.6.7 Alarm register group
The alarm registers are shown in
. The values in these registers are compared
with the time counters. If all the unmasked (See
Section 37.6.4 “Alarm Mask Register” on
) alarm registers match their corresponding time counters then an interrupt is
generated. The interrupt is cleared when a 1 is written to bit 1 of the Interrupt Location
Register (ILR[1]).
[1]
This register value is not changed by reset.
[1]
This register value is not changed by reset.
17
CALDIR
Calibration direction
-
0
Forward calibration. When CALVAL is equal to the
calibration counter, the RTC timers will jump by 2 seconds.
1
Backward calibration. When CALVAL is equal to the
calibration counter, the RTC timers will stop incrementing for
1 second.
31:18
-
Reserved, user software should not write ones to reserved
bits. The value read from a reserved bit is not defined.
-
Table 895. Calibration register (CALIBRATION - address 0x4004 6040) bit description
Bit
Symbol
Value
Description
Reset
value
Table 896. Alarm registers
Name
Size
Description
Access
Address
ALSEC
6
Alarm value for Seconds
R/W
0x4004 6060
ALMIN
6
Alarm value for Minutes
R/W
0x4004 6064
ALHRS
5
Alarm value for Hours
R/W
0x4004 6068
ALDOM
5
Alarm value for Day of Month
R/W
0x4004 606C
ALDOW
3
Alarm value for Day of Week
R/W
0x4004 6070
ALDOY
9
Alarm value for Day of Year
R/W
0x4004 6074
ALMON
4
Alarm value for Months
R/W
0x4004 6078
ALYEAR
12
Alarm value for Years
R/W
0x4004 607C
Table 897. Alarm Seconds register (ASEC - address 0x4004 6060) bit description
Bit
Symbol
Description
Reset
value
5:0
SECONDS
Seconds value in the range of 0 to 59
31:6
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Table 898. Alarm Minutes register (AMIN - address 0x4004 6064) bit description
Bit
Symbol
Description
Reset
value
5:0
MINUTES
Minutes value in the range of 0 to 59
31:6
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-