Computer Hardware User's Manual

102
CHAPTER 5 EXPLANATION OF INSTRUCTIONS
User's Manual U12326EJ4V0UM
Push
PUSH
Push
[Instruction format] PUSH src
[Operation] When src = rp When src = PSW
(SP–1) ← src
H, (SP–1) ← src
(SP–2) ← src
L,SP← SP–1
SP ← SP–2
[Operand]
Mnemonic Operand(src)
PUSH PSW
rp
[Flag]
ZACCY
[Description]
• The data of the register specified by the source operand (src) is saved to the stack.
[Description example]
PUSH AX; AX register contents are saved to the stack.