NXP Semiconductors LPC1768 - Page 562

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User manual Rev. 3 — 19 December 2013 562 of 841
NXP Semiconductors
UM10360
Chapter 27: LPC176x/5x Real-Time Clock (RTC) and backup registers
[1] Reset values apply only to a power-up of the RTC block, other types of reset have no effect on this block.
Since the RTC is powered whenever either of the V
DD(REG)(3V3)
, or V
BAT
supplies are present, power-up
reset occurs only when both supplies were absent and then one is turned on. Most registers are not
affected by power-up of the RTC and must be initialized by software if the RTC is enabled. The Reset Value
reflects the data stored in used bits only. It does not include reserved bits content.
Table 507. Real-Time Clock register map
Name Description Access Reset
Value
[1]
Address
Miscellaneous registers (see Section 27.6.2
)
ILR Interrupt Location Register R/W 0 0x4002 4000
CCR Clock Control Register R/W NC 0x4002 4008
CIIR Counter Increment Interrupt Register R/W 0 0x4002 400C
AMR Alarm Mask Register R/W 0 0x4002 4010
RTC_AUX RTC Auxiliary control register R/W 0x10 0x4002 405C
RTC_AUXEN RTC Auxiliary Enable register R/W 0 0x4002 4058
Consolidated time registers (see Section 27.6.3
)
CTIME0 Consolidated Time Register 0 RO NC 0x4002 4014
CTIME1 Consolidated Time Register 1 RO NC 0x4002 4018
CTIME2 Consolidated Time Register 2 RO NC 0x4002 401C
Time counter registers (see Section 27.6.4
)
SEC Seconds Counter R/W NC 0x4002 4020
MIN Minutes Register R/W NC 0x4002 4024
HOUR Hours Register R/W NC 0x4002 4028
DOM Day of Month Register R/W NC 0x4002 402C
DOW Day of Week Register R/W NC 0x4002 4030
DOY Day of Year Register R/W NC 0x4002 4034
MONTH Months Register R/W NC 0x4002 4038
YEAR Years Register R/W NC 0x4002 403C
CALIBRATION Calibration Value Register R/W NC 0x4002 4040
General purpose registers (see Section 27.6.6
)
GPREG0 General Purpose Register 0 R/W NC 0x4002 4044
GPREG1 General Purpose Register 1 R/W NC 0x4002 4048
GPREG2 General Purpose Register 2 R/W NC 0x4002 404C
GPREG3 General Purpose Register 3 R/W NC 0x4002 4050
GPREG4 General Purpose Register 4 R/W NC 0x4002 4054
Alarm register group (see Section 27.6.7
)
ALSEC Alarm value for Seconds R/W NC 0x4002 4060
ALMIN Alarm value for Minutes R/W NC 0x4002 4064
ALHOUR Alarm value for Hours R/W NC 0x4002 4068
ALDOM Alarm value for Day of Month R/W NC 0x4002 406C
ALDOW Alarm value for Day of Week R/W NC 0x4002 4070
ALDOY Alarm value for Day of Year R/W NC 0x4002 4074
ALMON Alarm value for Months R/W NC 0x4002 4078
ALYEAR Alarm value for Year R/W NC 0x4002 407C