Addressing Modes. Addressing Modes. Implicit part of CPU12 instructions 16-bit effective address Each addressing mode except inherent mode generates a which is used during the memory reference portion of the instruction. Effective address computations do not require extra execution cycles.
(operand is X register)
L1 is a label in [PC-128,PC+127] range.
L1 is a label in [PC–32768,PC+32767] range.
L1 is a label in [PC,PC+255] range
L1 is a label in [PC-256,PC) range
L1 is a label in [PC-128,PC+127] range
rr=00 for X, 01 for Y, 10 for SP, 11 for PC
LDAA 0,X A6 00 rPf
STAB –8,Y 6B 58 Pw
LDAA $FF,X A6 E0 FF rPO
STAB –20,Y 6B E9 EC PwO
LDAA $FFFF,X A6 E2 FF FF frPP
LDAA 3,X+ A6 32 rPf
$1000→ (A), (X)=$1003
LDAA B,X A6 E5 rPf
(X)=$1000, $1000+(B)→ (A),
Assume (X)=$1000 and D=0002 and $1002:$1003=$1015 and $1015=$25
LDAA [D,X] A6 E3 fIfrPf