376 datasheet(90/95 Pages) INTEL

90 / 95 page

376 EMBEDDED PROCESSOR

Encoding of Normal Address Mode with ‘‘mod rm’’ byte (no ‘‘s-i-b’’ byte present)

mod rm

Effective Address

00 000

DS EAX

00 001

DS ECX

00 010

DS EDX

00 011

DS EBX

00 100

s-i-b is present

00 101

DSd32

00 110

DS ESI

00 111

DS EDI

01 000

DS EAXad8

01 001

DS ECXad8

01 010

DS EDXad8

01 011

DS EBXad8

01 100

s-i-b is present

01 101

SS EBPad8

01 110

DS ESIad8

01 111

DS EDIad8

mod rm

Effective Address

10 000

DS EAXad32

10 001

DS ECXad32

10 010

DS EDXad32

10 011

DS EBXad32

10 100

s-i-b is present

10 101

SS EBPad32

10 110

DS ESIad32

10 111

DS EDIad32

11 000

registersee below

11 001

registersee below

11 010

registersee below

11 011

registersee below

11 100

registersee below

11 101

registersee below

11 110

registersee below

11 111

registersee below

during Normal Data Operations

mod rm

function of w field

(when we0)

(when we1)

11 000

EAX

11 001

ECX

11 010

EDX

11 011

EBX

11 100

ESP

11 101

EBP

11 110

ESI

11 111

EDI

during 16-Bit Data Operations (66H Prefix)

mod rm

function of w field

(when we0)

(when we1)

11 000

11 001

11 010

11 011

11 100

11 101

11 110

11 111

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