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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PERIPHERAL INTERFACING–I 9-19
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
Thus, 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
11011/001
D7 D6D5D4 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 ...
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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.