Texas Instruments MSP430x1xx manual Pop.B

Instruction Set

* POP[.W]	Pop word from stack to destination
* POP.B	Pop byte from stack to destination
Syntax	POP	dst
	POP.B	dst
Operation	@SP	−> temp
	SP + 2 −> SP
	temp −> dst
Emulation	MOV	@SP+,dst	or MOV.W @SP+,dst
Emulation	MOV.B	@SP+,dst
Description	The stack location pointed to by the stack pointer (TOS) is moved to the
	destination. The stack pointer is incremented by two afterwards.
Status Bits	Status bits are not affected.
Example	The contents of R7 and the status register are restored from the stack.
	POP	R7	; Restore R7
	POP	SR	; Restore status register
Example	The contents of RAM byte LEO is restored from the stack.
	POP.B	LEO	; The low byte of the stack is moved to LEO.
Example	The contents of R7 is restored from the stack.
	POP.B	R7	; The low byte of the stack is moved to R7,
			; the high byte of R7 is 00h
Example	The contents of the memory pointed to by R7 and the status register are
	restored from the stack.
	POP.B	0(R7)	; The low byte of the stack is moved to the
			; the byte which is pointed to by R7
			: Example:	R7 = 203h
			;	Mem(R7) = low byte of system stack
			: Example:	R7 = 20Ah
			;	Mem(R7) = low byte of system stack
	POP	SR	; Last word on stack moved to the SR

Note: The System Stack Pointer

The system stack pointer (SP) is always incremented by two, independent of the byte suffix.

3-54 RISC 16−Bit CPU