Data Movement

• Instructions
load value or contents of memory location into register
ldaa, ldab, ldd, lds, ldx, ldy

HLL Code	Corresponding Assembly Code
a = value;	ldaa value
b = value;	ldab value
d = value;	ldd value
s = value;	lds value
x = value;	ldx value
y = value;	ldy value

value may be either a constant using # or a variable.

store contents of register into memory location
staa, stab, std, sts, stx, sty

HLL Code	Corresponding Assembly Code
variable = a;	staa variable
variable = b;	stab variable
variable = d;	std variable
variable = s;	sts variable
variable = x;	stx variable
variable = y;	sty variable

transfer contents between registers
tab, tap, tba, tpa, tsx, tsy, txs, tys, xgdx, xgdy
push an item on the stack
psha, pshb, pshx, pshy,
pop an item off the stack
pula, pulb, pulx, puly
• Addressing Modes
Immediate:
#sym Operand is sym
Direct:
sym Operand is M[sym] (eight bit)
Extended:
sym Operand is M[sym] (sixteen bit)
Indexed:
sym,x Operand is M[sym+x]
sym,y Operand is M[sym+y]