UM10360 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved.
User manual Rev. 3 — 19 December 2013 566 of 841
NXP Semiconductors
UM10360
Chapter 27: LPC176x/5x Real-Time Clock (RTC) and backup registers
27.6.3 Consolidated time registers
The values of the Time Counters can optionally be read in a consolidated format which
allows the programmer to read all time counters with only three read operations. The
various registers are packed into 32-bit values as shown in Table 514
, Table 515, and
Table 516
. The least significant bit of each register is read back at bit 0, 8, 16, or 24.
The Consolidated Time Registers are read-only. To write new values to the Time
Counters, the Time Counter addresses should be used.
27.6.3.1 Consolidated Time Register 0 (CTIME0 - 0x4002 4014)
The Consolidated Time Register 0 contains the low order time values: Seconds, Minutes,
Hours, and Day of Week.
27.6.3.2 Consolidated Time Register 1 (CTIME1 - 0x4002 4018)
The Consolidate Time Register 1 contains the Day of Month, Month, and Year values.
27.6.3.3 Consolidated Time Register 2 (CTIME2 - 0x4002 401C)
The Consolidate Time Register 2 contains just the Day of Year value.
Table 514. Consolidated Time register 0 (CTIME0 - address 0x4002 4014) bit description
Bit Symbol Description Reset
value
5:0 Seconds Seconds value in the range of 0 to 59 NC
7:6 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
13:8 Minutes Minutes value in the range of 0 to 59 NC
15:14 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
20:16 Hours Hours value in the range of 0 to 23 NC
23:21 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NC
26:24 Day Of Week Day of week value in the range of 0 to 6 NA
31:27 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NC
Table 515. Consolidated Time register 1 (CTIME1 - address 0x4002 4018) bit description
Bit Symbol Description Reset
value
4:0 Day of Month Day of month value in the range of 1 to 28, 29, 30, or 31 (depending on the month and
whether it is a leap year).
NC
7:5 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
11:8 Month Month value in the range of 1 to 12. NC
15:12 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
27:16 Year Year value in the range of 0 to 4095. NC
31:28 - Reserved, user software should not write ones to reserved bits. The value read from a
reserved bit is not defined.
NA
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