May 2024
Intermediate to advanced
665 pages
23h 2m
English
book
The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
by Lyla B. Das
Content preview from The X86 Microprocessors: Architecture and Programming (8086 to Pentium), 1st Edition
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PERIPHERAL INTERFACING I 307
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
I/O I/O IBF
A
INTE
A
INTR
A
INTE
B
OBF
B
INTR
B
us the status of Port C will be as shown.
What is needed, is to read in Port C and test the condition of D
5
for knowing the status of IBF
A
.
Test the condition of D
1
for the status of OBF
B
IN AL, PORTC ;read in the contents of Port C
TEST AL, 5 ;for testing the condition of D
5
, IFB
A
TEST AL, 1 ;for testing the condition of D
1
, OFB
B
PC
4, 5
PORT A – (STROBED OUTPUT)
PORT B – (STROBED INPUT)
RD
8
8
1=INPUT
0=OUTPUT
PA7–PA0
PC
7
PC
6
PC
3
PC
4, 5
PB7–PB0
PC
2
PC
1
PC
0
WR
CONTROL WORD
110 11/001
D7
D6
D5
D4
D3
D2
D1
D0
INTR
A
I/O
INTR
B
IBF
B
STB
B
OBF
A
ACK
A
Figure 9.16 | Port A in strobed output ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.