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(freebsd section 4)
man page for atrtc

ATRTC(4)						   BSD Kernel Interfaces Manual 						  ATRTC(4)

atrtc -- AT Real-Time Clock (RTC) driver SYNOPSIS
This driver is a mandatory part of i386/amd64 kernels. The following tunable is settable from the loader(8): hint.atrtc.X.clock controls event timers functionality support. Setting to 0, disables it. Default value is 1. DESCRIPTION
This driver uses RTC hardware to supply kernel with time-of-day clock with 1 second resolution and one event timer. This hardware uses base frequency of 32768Hz for advancing time-of-day clock and generating periodic interrupts. Interrupts could be generated with fixed number of frequencies, from 2Hz to 8192Hz, obtained by dividing base frequency by one of supported power-of-2 divisors. Event timer provided by the driver is irrelevant to CPU power states. SEE ALSO
apic(4), attimer(4), eventtimers(4), hpet(4) BSD
September 17, 2010 BSD
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