(a) Discuss about the various interrupt sources and disabling interrupts in RTOS.
Explanation
Interrupts are signals to the CPU that an event has occurred. There are three types of interrupt sources: Hardware interrupts, Software interrupts, and Exception interrupts. Hardware interrupts are generated by hardware devices, Software interrupts are generated by software instructions, and Exception interrupts are generated by errors or exceptions. Disabling interrupts is necessary to prevent multiple interrupts from occurring simultaneously. This can be done using the CLI (Clear Interrupt Flag) instruction.
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