IA186EM-PQF100I-R datasheet(86/133 Pages) INNOVASIC

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IA186EM/IA188EM

Data Sheet

8/16-BIT Microcontrollers

As of Production Version -03

mod field (Modifier Field)

mod

Description

r/m is treated as a register field

DISP = 0, disp-low and disp-high are absent - address displacement is 0.

DISP = disp-low sign-extended to 16-bits, disp-high is absent.

DISP = disp-high: disp-low.

aux field (Auxiliary Field)

aux

If mod = 11 and word = 0

If mod = 11 and word = 1

000

001

010

011

100

101

110

111

When mod

$ 11, depends on instruction

r/m field

r/m

Description

000

EA = (BX) + (SI) + DISP [where EA is the Effective Address]

001

EA = (BX) + (DI) + DISP

010

EA = (BP) + (SI) + DISP

011

EA = (BX) + (DI) + DISP

100

EA = (SI) + DISP

101

EA = (DI) + DISP

110

EA = (BP) + DISP [except if mod = 00, then EA = disp-high: disp-low]

111

EA = (BX) + DISP

Displacement

The displacement is an 8 or 16 bit value added to the offset portion of the address.

Immediate

The immediate bytes consist of up to 16 bits of immediate data.

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