Atmel AVR

108. SEI – Set Global Interrupt Flag
108.1. 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
108.2. 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
Atmel AVR Instruction Set Manual [OTHER]
Atmel-0856L-AVR-Instruction-Set-Manual_Other-11/2016
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