WM8321 Datasheet, PDF (105/253 Pages) Wolfson Microelectronics plc – Processor Power Management Subsystem

Production Data
WM8321
ADDRESS
R16416
(4020h)
RTC Write
Counter
R16417
(4021h)
RTC Time 1
R16418
(4022h)
RTC Time 2
R16419
(4023h)
RTC Alarm 1
R16420
(4024h)
RTC Alarm 2
R16421
(4025h)
RTC Control
BIT
LABEL
15:0 RTC_WR_CNT
15:0 RTC_TIME
[31:16]
15:0 RTC_TIME [15:0]
15:0 RTC_ALM [31:16]
15:0 RTC_ALM [15:0]
15 RTC_VALID
14 RTC_SYNC_BUS
Y
R16422
(4026h)
RTC Trim
10 RTC_ALM_ENA
9:0 RTC_TRIM
Table 49 Real Time Clock (RTC) Control
DEFAULT
0000h
0000h
0000h
0000h
0000h
0
0
0
000h
DESCRIPTION
RTC Write Counter.
This random number is updated on
every write to the RTC_TIME
registers.
RTC Seconds counter (MSW)
RTC_TIME increments by 1 every
second. This is the 16 MSBs.
RTC Seconds counter (LSW)
RTC_TIME increments by 1 every
second. This is the 16 LSBs.
RTC Alarm time (MSW)
16 MSBs of RTC_ALM
RTC Alarm time (LSW)
16 LSBs of RTC_ALM
RTC Valid status
0 = RTC_TIME has not been set
since Power On Reset
1 = RTC_TIME has been written to
since Power On Reset
RTC Busy status
0 = Normal
1 = Busy
The RTC registers should not be
written to when RTC_SYNC_BUSY =
1.
RTC Alarm Enable
0 = Disabled
1 = Enabled
RTC frequency trim. Value is a 10bit
fixed point <4,6> 2’s complement
number. MSB Scaling = -8Hz.
The register indicates the error (in
Hz) with respect to the ideal
32768Hz) of the input crystal
frequency.
Protected by user key
w
PD, February 2012, Rev 4.0
105