Why RETI instruction be the last instruction of ISR?

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answerhappygod
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Why RETI instruction be the last instruction of ISR?

Post by answerhappygod »

a) because it returns with carry
b) because it returns to the main program with all the flags of the SREG raised
c) because it returns to the main program where interrupt is generated and set the global interrupt enable bit in SREG
d) none of the mentioned
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