Системы адресации в Мини- и МикpоЭВМ

Реферат - Компьютеры, программирование

; , AX.

3.6 .

, , ( SI,DI ) . 32- , EAX, ECX, EDX, EBX, EBP, ESI, EDI.. MOV WORD PTR ES:[DI+2],AX, ES:[DI+2] AX.

MOV WORD PTR ES:[DI+2],AX

AX = 0099h

DI = 000Dh

ES:000Dh = 0000h (di)

ES:000Fh = 0000h (di+2)

...

AX = 0099h

DI = 000Dh

ES:000Dh = 0000h

ES:000Fh = 0099h < 99h

ES:000Fh DI 2 = F. 99h AX .

3.7 - .

( BX,BP ) ( SI,DI ) . MOV AX,[BP+SI] :

MOV AX,[BP+SI]

AX = 00AAh

BP = 0100h

SI = 0050h

DS:0100h = 0001h (bp)

DS:0150h = 0002h (bp+si)

...

AX = 0002h < 02h

BP = 0100h

SI = 0050h

DS:0100h = 0001h

DS:0150h = 0002h

DS:0150h BP SI, AX.

3.8 - .

, 8- 16- . 32- , (SIB) . [EAX+EBX], [EAX+EAX], [ECX+EDX], ESP. F .. 0,1,3 4. F . MOV EAX,[EAX+EAX].

MOV EAX,[EAX+EAX]

EAX = 0010h

DS:0010h = 000Ah (eax)

DS:0020h = 000Bh (eax+eax)

...

EAX = 000Bh < 0Bh

DS:0010h = 000Ah

DS:0020h = 000Bh

EAX, EAX DS:0020h EAX.

3.9