Please Solve Both

1. About the following instructions, which of the followings are TRUE about WFI() command? ( Note : MORE THAN ONE CAN BE TRUE ) _ WFI();

A) The processor goes to standby/sleep mode and waits for interrupts.

B) The processor will be busy checking if there is an interrupt emitted from the hardware, i.e. buttons.

C) It reduces the power consumption.

D) It requires more power to run.

2. Which of the followings are true about Interrupt and ISR (interrupt service routine)? ( Note : MORE THAN ONE CAN BE TRUE )

A) Interrupts and ISRs must be defined in advance, so that when it happens, the processor knows what interrupt it is and which ISR to execute.

B) An ISR is the program that defines the immediate action to be taken upon an interrupt.

C) An ISR is a signal emitted by software or hardware requesting immediate attention

D) An interrupt is a signal emitted by software or hardware requesting immediate attention.