Sony CXD5602 User Manual page 186

3.6.5.2.12 RtPostCnt(0x40)
31 30 29 28
Post
RO
15 14 13 12
Post
RO

bit[31:0] : Post[31:0] (PostCounter value when RtPostCnt was read)
The following are differences from Rd(Post/Pre)Cnt.

There is no need to issue a Read Request (RdReq).

After you write "1" on RdReq, there is no restriction to wait for RdReq to become 0.

Restriction on the use of this register

AS for Rt(Post/Pre)Cnt, read RtPostCnt before reading RtPreCnt.

If relation between CK_APB and CK_RTC (RTC Clock (32.768kHz)) is "frequency of CK_APB <
frequency of CK_RTC ×10", do not read Rt(Post/Pre)Cnt. The value cannot be guaranteed.
3.6.5.2.13 RtPreCnt(0x44)
31 30 29 28
Reserved
-
15 14 13 12
Rese
Pre
rved
- RO

bit[14:0] : Pre[14:0] (PreCounter value when PostCounter was read)
By reading this register, you can see the PreCounter value at the point of time when you read RtPostCnt.
27 26 25 24
11 10 9 8
27 26 25 24
11 10 9 8
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23 22 21 20
7 6 5 4
23 22 21 20
7 6 5 4
CXD5602 User Manual
19 18 17 16
3 2 1 0
19 18 17 16
3 2 1 0