M80C286 Ver la hoja de datos (PDF) - Intel

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M80C286

HIGH PERFORMANCE CHMOS MICROPROCESSOR WITH MEMORY MANAGEMENT AND PROTECTION

Intel 

M80C286

Footnotes

The Effective Address (EA) of the memory operand

is computed according to the mod and r m fields

if mod e 11 then r m is treated as a REG field

if mod e 00 then DISP e 0 disp-low and disp-high

are absent

if mod e 01 then DISP e disp-low sign-extended to

16 bits disp-high is absent

if mod e 10 then DISP e disp-high disp-low

if r m e 000 then EA e (BX) a (SI) a DISP

if r m e 001 then EA e (BX) a (DI) a DISP

if r m e 010 then EA e (BP) a (SI) a DISP

if r m e 011 then EA e (BP) a (DI) a DISP

if r m e 100 then EA e (SI) a DISP

if r m e 101 then EA e (DI) a DISP

if r m e 110 then EA e (BP) a DISP

if r m e 111 then EA e (BX) a DISP

DISP follows 2nd byte of instruction (before data if

required)

except if mod e 00 and r m e 110 then EQ e disp-high disp-low

REG is assigned according to the following table

16-Bit (w e 1)

8-Bit (w e 0)

000 AX

000 AL

001 CX

001 CL

010 DX

010 DL

011 BX

011 BL

100 SP

100 AH

101 BP

101 CH

101 SI

110 DH

111 DI

111 BH

The physical addresses of all operands addressed

by the BP register are computed using the SS seg-

ment register The physical addresses of the desti-

nation operands of the string primitive operations

(those addressed by the DI register) are computed

using the ES segment which may not be overridden

SEGMENT OVERRIDE PREFIX

0 0 1 reg 1 1 0

reg is assigned according to the following

Segment

reg Register

00

ES

01

CS

10

SS

11

DC

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