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
a = 0;	clra
b = 0;	clrb

value may be either a constant using "#" to specify immediate addressing or a variable.

store contents of register or value 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
variable = 0;	clr variable

transfer contents between registers

tab, tap, tba, tpa, tsx, tsy, txs, tys, xgdx, xgdy

HLL code	Corresponding Assembly Code
b = a;	tab
ccr = a;	tap
a = b;	tba
x = s+1;	tsx
y = s+1;	tsy
s = x-1;	txs
s = y-1;	tys
swap(d, x);	xgdx
swap(d, y);	xgdy

push an item on the stack

psha, pshb, pshx, pshy,

pop an item off the stack

pula, pulb, pulx, puly