M80C286 datasheet(7/60 Pages) INTEL

7 / 60 page

M80C286

Indexed Mode

The operand’s offset is the sum of

an 8 or 16-bit displacement and the contents of an

index register (SI or DI)

Based Indexed Mode

The operand’s offset is the

sum of the contents of a base register and an index

Based Indexed Mode with Displacement

The op-

erand’s offset is the sum of a base register’s con-

tents an index register’s contents and an 8 or 16-bit

displacement

Data Types

The M80C286 directly supports the following data

types

Integer

A signed binary numeric value con-

tained in an 8-bit byte or a 16-bit

word All operations assume a 2’s

complement representation Signed

32 and 64-bit integers are supported

using the Numeric Data Processor

the M80C287

Ordinal

An unsigned binary numeric value

contained in an 8-bit byte or 16-bit

word

Pointer

A 32-bit quantity composed of a

segment selector component and an

offset component Each component

is a 16-bit word

String

A contiguous sequence of bytes or

words A string may contain from 1

byte to 64K bytes

ASCII

A byte representation of alphanu-

meric and control characters using

the ASCII standard of character rep-

resentation

BCD

A byte (unpacked) representation of

the decimal digits 0 – 9

Packed BCD

A byte (packed) representation of

two decimal digits 0 – 9 storing one

digit in each nibble of the byte

Floating Point A signed 32 64 or 80-bit real num-

ber representation

(Floating point

operands are supported using the

M80C287 Numeric Processor)

Figure 6 graphically represents the data types sup-

ported by the M80C286

IO Space

The IO space consists of 64K 8-bit or 32K 16-bit

ports IO instructions address the IO space with

either an 8-bit port address specified in the instruc-

tion or a 16-bit port address in the DX register 8-bit

port addresses are zero extended such that A15–A8

are LOW

IO port addresses 00F8(H) through

00FF(H) are reserved

271103 – 5

Figure 6 M80C286 Supported Data Types

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