MCIMX27 Datasheet, PDF (1234/1650 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor

Real Time Clock (RTC)
Always 1 Always 0 R/W BIT Read- BIT Write-
Write 1 BIT Self-clear 0 N/A
reads 1
reads 0
bit
only bit
only bit
to clear
BIT
w1c
bit
BIT
Figure 33-2. Key to Register Fields
Table 33-3. Register Figure Conventions
Convention
Description
Depending on its placement in the read or write row, indicates that the bit is not readable or not writable.
FIELDNAME Identifies the field. Its presence in the read or write row indicates that it can be read or written.
Register Field Types
r
Read only. Writing this bit has no effect.
w
Write only.
rw
Standard read/write bit. Only software can change the bit’s value (other than a hardware reset).
rwm
A read/write bit modified by a hardware in some fashion other than by a reset.
w1c
Write one to clear. A status bit that can be read, and is cleared by writing a one.
Self-clearing Writing a one has some effect on the module, but it always reads as zero.
bit
Reset Values
0
Resets to zero.
1
Resets to one.
—
Undefined at reset.
u
Unaffected by reset.
[signal_name] Reset value is determined by polarity of indicated signal.
Table 33-4 shows the RTC register summary.
Table 33-4. RTC Register Summary
Name
0x1000_7000
(HOURMIN)
0x1000_7004
(SECONDS)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
R0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
R0 0 0
W
HOUR
00
MINUTES
R0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
R0 0 0 0 0 0 0 0 0 0
W
SECONDS
33-4
MCIMX27 Multimedia Applications Processor Reference Manual, Rev. 0.2
Freescale Semiconductor