1989_MELPS_7700_Software_Manual

Stack
Mode
Function
Stack addressing mode
Register contents are saved to or restored from the memory location specified by the
stack pointer. The stack pointer is set in bank-D.
Instruction:
PEA,
PHY,
PEl,
PLA,
PER,
PLB,
PHA,
PLD,
PHB,
PLP,
PHD,
PLT,
PHG,
PLX,
PHP,
PLY,
PHT,
PSH,
PHX,
PUL
ex.
: Mnemonic
PHA
(m=1)
Machine Code
48 '6
ex.
: Mnemonic
PHA
(m=O)
Machine Code
48 '6
Memory
Memory
S-l
S
AL
Stack POinter
0016~
Bank-O
S-2
S-l
S
AL
AH
Stack POinter
0016~
8ank-O
r-------
------
-
ex.
: Mnemonic
PHD
Machine Code
OB '6
ex.
: Mnemonic
Machine Code
PEA # 1234H F4 '6 34 '6 12 '6
Memory
Memory
S-2
S-l
S
OPR L
OPR H
Stack POinter
0016~
Bank-O
S-2
'1
S-l
34'6
12'6
Stack POinter
OO'6~
Bank-O
--:------
-
-------
,------
\
Op Code (F4'6)
Operand (34 16 )
Operand (12,6)
r-------
-
40