Nxp Semiconductors UM10237 用户手册
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
649 of 792
NXP Semiconductors
UM10237
Chapter 26: LPC24XX Real-Time Clock (RTC) and battery RAM
6.
Register description
The RTC includes a number of registers. The address space is split into four sections by
functionality. The first eight addresses are the Miscellaneous Register Group
(
functionality. The first eight addresses are the Miscellaneous Register Group
(
). The second set of eight locations are the Time Counter Group
). The third set of eight locations contain the Alarm Register Group
). The remaining registers control the Reference Clock Divider.
. Detailed descriptions
of the registers follow. In these descriptions, for most of the registers the Reset Value
column shows "NC", meaning that these registers are not changed by a Reset. Software
must initialize these registers between power-on and setting the RTC into operation.
column shows "NC", meaning that these registers are not changed by a Reset. Software
must initialize these registers between power-on and setting the RTC into operation.
Table 566. Summary of Real-Time Clock registers
Name
Size
Description
Access Reset
Value
Address
ILR
2
Interrupt Location Register
R/W
NC
0xE002 4000
CTC
15
Clock Tick Counter
RO
NC
0xE002 4004
CCR
4
Clock Control Register
R/W
NC
0xE002 4008
CIIR
8
Counter Increment Interrupt Register
R/W
NC
0xE002 400C
AMR
8
Alarm Mask Register
R/W
NC
0xE002 4010
CTIME0
32
Consolidated Time Register 0
RO
NC
0xE002 4014
CTIME1
32
Consolidated Time Register 1
RO
NC
0xE002 4018
CTIME2
32
Consolidated Time Register 2
RO
NC
0xE002 401C
SEC
6
Seconds Counter
R/W
NC
0xE002 4020
MIN
6
Minutes Register
R/W
NC
0xE002 4024
HOUR
5
Hours Register
R/W
NC
0xE002 4028
DOM
5
Day of Month Register
R/W
NC
0xE002 402C
DOW
3
Day of Week Register
R/W
NC
0xE002 4030
DOY
9
Day of Year Register
R/W
NC
0xE002 4034
MONTH
4
Months Register
R/W
NC
0xE002 4038
YEAR
12
Years Register
R/W
NC
0xE002 403C
CISS
8
Counter Increment select mask for
Sub-Second interrupt
Sub-Second interrupt
R/W
NC
0xE002 4040
ALSEC
6
Alarm value for Seconds
R/W
NC
0xE002 4060
ALMIN
6
Alarm value for Minutes
R/W
NC
0xE002 4064
ALHOUR
5
Alarm value for Seconds
R/W
NC
0xE002 4068
ALDOM
5
Alarm value for Day of Month
R/W
NC
0xE002 406C
ALDOW
3
Alarm value for Day of Week
R/W
NC
0xE002 4070
ALDOY
9
Alarm value for Day of Year
R/W
NC
0xE002 4074
ALMON
4
Alarm value for Months
R/W
NC
0xE002 4078
ALYEAR
12
Alarm value for Year
R/W
NC
0xE002 407C
PREINT
13
Prescaler value, integer portion
R/W
0
0xE002 4080
PREFRAC 15
Prescaler value, fractional portion
R/W
0
0xE002 4084