M80C286 データシートの表示（PDF） - Intel
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M80C286 Datasheet PDF : 60 Pages
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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
register
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
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 I O port addresses 00F8(H) through
00FF(H) are reserved
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
I O Space
The I O space consists of 64K 8-bit or 32K 16-bit
ports I O instructions address the I O space with
271103 – 5
Figure 6 M80C286 Supported Data Types
7
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