May 2024
Intermediate to advanced
889 pages
30h 8m
English
book
The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
by Lyla B. Das
Content preview from The X 86 Microprocessors: Architecture, Programming and Interfacing (8086 to Pentium) 2nd Edition by Pearson
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ADVANCED PROCESSORS—80286 TO PENTIUM 14-9
DAT1 DW −269
DAT2 DB 56
DAT3 DB − 123
STRT: MOV AX, DAT1 ;AX = FEF3H
MOVSX ECX, AX ;ECX = FFFFFEF3H
MOVSX EBX, DAT2 ;EBX = 00000038H
MOVZX ECX, DAT1 ;ECX = 0000FEF3H
MOVSX AX, DAT3 ;AX = FF85H
END STRT
In Example 14.5, the numbers are expressed in the decimal format. In the hex format,
they are
DAT1 = FEF3H
DAT2 = 38H
DAT3 = 85H
Note The first number is stored as a word, and the next two are stored as bytes. The
result of each of the operations is shown in the comment field of the program.
14.5 | Hardware Features of 80386
The 80386 has 132 pins and is packaged as a pin grade array (PGA). ...
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