Answer all the questions below , An array of LEDs as connected below, is needed to be accessed by the 8255a interfacing. (a) Find the value of A0 to A7 in order to address port A and control register. (b) Find the logic circuit in order to keep chip select low while accessing control register and port A. (c) Construct the code segment in order to keep the LED array blinking on and off in an infinite loop. Initialize the 8255a as needed. Provide comments wherever necessary.
Answer all the questions below , An array of LEDs as connected below, is needed to be accessed by the 8255a interfacing. (a) Find the value of A0 to A7 in order to address port A and control register. (b) Find the logic circuit in order to keep chip select low while accessing control register and port A. (c) Construct the code segment in order to keep the LED array blinking on and off in an infinite loop. Initialize the 8255a as needed. Provide comments wherever necessary.
Fundamentals of Information Systems
9th Edition
ISBN:9781337097536
Author:Ralph Stair, George Reynolds
Publisher:Ralph Stair, George Reynolds
Chapter4: Networks And Cloud Computing
Section: Chapter Questions
Problem 6DQ
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Answer all the questions below ,
An array of LEDs as connected below, is needed to be accessed by the 8255a interfacing.
(a) Find the value of A0 to A7 in order to address port A and control register.
(b) Find the logic circuit in order to keep chip select low while accessing control register and
port A.
(c) Construct the code segment in order to keep the LED array blinking on and off in an infinite
loop. Initialize the 8255a as needed. Provide comments wherever necessary.
![A1 A0
80H PORT A
Memory
addresses
81H PORT B
1
1 0
82H PORT C
83H CINTROL
REGISTER
1
1
AO
A1
Port A
8086
A2
Logic?
CS
A7
8255A](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd35cfdaf-62ca-4fe0-95ef-9bd61d1b103d%2F65fc1ab8-21c4-4e4a-8747-6fa35117e141%2F08m0la_processed.png&w=3840&q=75)
Transcribed Image Text:A1 A0
80H PORT A
Memory
addresses
81H PORT B
1
1 0
82H PORT C
83H CINTROL
REGISTER
1
1
AO
A1
Port A
8086
A2
Logic?
CS
A7
8255A
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