GLAST/LAT > DAQ and FSW > FSW > FSW Task Index > 1 PPS Interrupt
1 PPS Interrupt (Animation)
DescriptionThe spacecraft provides a "1-PPS time hack" interrupt each second (i.e., one pulse per second). When awakened by this interrupt, this task updates the processor's local time value. It works cooperatively with the Spacecraft Attitude/Time slaves (via shared memory structures) to build time interpolation tables. The Spacecraft emits Time Hack interrupts. The 1 PPS interrupt routine handles these, updating the Time Table.
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