diff options
Diffstat (limited to 'man4/rtc.4')
| -rw-r--r-- | man4/rtc.4 | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -62,12 +62,12 @@ The system clock reports seconds and microseconds since a start point, defined to be the POSIX Epoch: Jan 1, 1970, 0:00 UTC. (One common implementation counts timer interrupts, once per "jiffy", at a frequency of 100, 250, or 1000 Hz.) -That is, it's supposed to report wall clock time, which RTCs also do. +That is, it is supposed to report wall clock time, which RTCs also do. A key difference between an RTC and the system clock is that RTCs run even when the system is in a low power state (including "off"), and the system clock can't. -Until it's initialized, the system clock can only report time since +Until it is initialized, the system clock can only report time since system boot ... not since the POSIX Epoch. So at boot time, and after resuming from a system low power state, the system clock will often be set to the current wall clock time using an RTC. |