From: Voon Weifeng
Date: Wed, 19 Jun 2019 22:13:48 +0800
> From: Roland Hii
>
> When ADDSUB bit is set, the system time seconds field is calculated as
> the complement of the seconds part of the update value.
>
> For example, if 3.1 seconds need to be subtracted from the
> system time,
From: Roland Hii
When ADDSUB bit is set, the system time seconds field is calculated as
the complement of the seconds part of the update value.
For example, if 3.1 seconds need to be subtracted from the
system time, this field is calculated as
2^32 - 3 = 4294967296 - 3 = 0x1 - 3
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