ISD94100 Series Technical Reference Manual
Sep 9, 2019
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Rev1.09
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RTC Access Enable Register (RTC_RWEN)
Register
Offset
R/W Description
Reset Value
RTC_RWEN
0x04
R/W RTC Access Enable Register
0x0000_0000
31
30
29
28
27
26
25
24
Reserved
RTCBUSY
23
22
21
20
19
18
17
16
Reserved
RWENF
15
14
13
12
11
10
9
8
Reserved
7
6
5
4
3
2
1
0
Reserved
Bits
Description
[31:25]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[24]
RTCBUSY
RTC Write Busy Flag
This bit indicates RTC registers are writable or not.
0: RTC registers are writable.
1: RTC registers can’t write, RTC under Busy Status.
Note:
RTCBUSY flag will be set when execute write RTC register command exceed 6 times
within 1120 PCLK cycles.
[23:17]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.
[16]
RWENF
RTC Register Access Enable Flag (Read Only)
0 = RTC register read/write Disabled.
1 = RTC register read/write Enabled.
Note:
RWENF will be mask to 0 during RTCBUSY is 1, and first turn on RTCCKEN
(CLK_APBCLK[1]) also.
[15:0]
Reserved
Reserved. Any values read should be ignored. When writing to this field always write with
reset value.