That reversal of definitions makes sense. The author goes on to talk about how software—and programmers—can minimize interrupt latency, and he introduces the Link-Service Routine (LSR).

The code defines an interrupt service routine (ISR) that simply stashes the received byte into the circular buffer when anything comes in over the serial line.

Further complicating backlogs on routine childhood immunizations is a two-week period in between the administration of the COVID-19 vaccine and any others, as recommended by the CDC.

Welcome to part three of “Interrupts: The Good, the Bad, and the Ugly”. We’ve already professed our love for interrupts, showing how they are useful for solving multiple common mi… ...

The processor would stop what it was doing to execute the corresponding interrupt service routines and then resume its original task.