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    Description:

    Sets the Global Interrupt flag (I) in SREG (status register). The instruction following SEI will be executed before any pending interrupts.

    Operation:

    (i) I ← 1

    Syntax: Operands: Program Counter:

    (i) SEI None PC ← PC + 1

    16-bit Opcode:

    1001

    0100

    0111

    1000

    Status Register (SREG) and Boolean Formula:

    I

    T

    H

    S

    V

    N

    Z

    C

    1

    -

    -

    -

    -

    -

    -

    -

    I: 1

    Global Interrupt flag set

    Example: 

    sei ; set global interrupt enable
sleep ; enter sleep, waiting for interrupt
; note: will enter sleep before any pending interrupt(s)

    Words: 1 (2 bytes)

    Cycles: 1

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