8051 instruction :: Ret

RET


Operation:RET
Function:Return From Subroutine
Syntax:RET

InstructionsOpCodeBytesCyclesFlags
RET0x2212None

Description: RET is used to return from a subroutine previously called by LCALL or ACALL. Program execution continues at the address that is calculated by popping the topmost 2 bytes off the stack. The most-significant-byte is popped off the stack first, followed by the least-significant-byte.


RETI

Operation:RETI
Function:Return From Interrupt
Syntax:RETI

InstructionsOpCodeBytesCyclesFlags
RETI0x3212None

Description: RETI is used to return from an interrupt service routine. RETI first enables interrupts of equal and lower priorities to the interrupt that is terminating. Program execution continues at the address that is calculated by popping the topmost 2 bytes off the stack. The most-significant-byte is popped off the stack first, followed by the least-significant-byte.

RETI functions identically to RET if it is executed outside of an interrupt service routine.









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