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A-29
INSTRUCTION SET REFERENCE
POP POP WORD. Pops the word on top of the
stack and places it at the destination
operand.
(DEST)
← (SP)
SP
← SP + 2
POP waop
(110011aa) (waop)
PSW Flag Settings
ZNCVVTST
——————
POPA POP ALL. This instruction is used instead of
POPF, to support the eight additional
interrupts. It pops two words off the stack and
places the first word into the
INT_MASK1/WSR register pair and the
second word into the PSW/INT_MASK
register-pair. This instruction increments the
SP by 4. Interrupt calls cannot occur
immediately following this instruction.
INT_MASK1/WSR
← (SP)
SP
← SP + 2
PSW/INT_MASK
← (SP)
SP
← SP + 2
POPA
(11110101)
PSW Flag Settings
ZNCVVTST
✓✓✓✓✓✓
POPF POP FLAGS. Pops the word on top of the
stack and places it into the PSW. Interrupt
calls cannot occur immediately following this
instruction.
(PSW)/INT_MASK
← (SP)
SP
← SP + 2
POPF
(11110011)
PSW Flag Settings
ZNCVVTST
✓✓✓✓✓✓
PUSH PUSH WORD. Pushes the word operand
onto the stack.
SP
← SP – 2
(SP)
← (DEST)
PUSH waop
(110010aa) (waop)
PSW Flag Settings
ZNCVVTST
——————
Table A-6. Instruction Set (Continued)
Mnemonic Operation Instruction Format