The Intel 8255 processor with an 8-bit data bus is configured as shown in the figure below ( PORT_A as INPUT, PORT_B as OUTPUT, PORT_CL as INPUT and PORT_CH as OUTPUT). Find the control register for the indicated configuration. HINT: Assuming not using the BSR to control PCs PORTS, only considering using the I/O MODE with a digit of 1. A0 Port_A 7 A1 CONTROL WORD (BYTE) D7 D6 D5 D4 D3 D2 D1 DO ? ? ? ? ? ? ? Control Word CS Port_B Port CL (PC3-PC0) 1= INPUT; 0 = OUTPUT Port B 1= INPUT; 0 = OUTPUT Mode Select 0 - Mode 0 1- mode 1 1= VO Mode 0 = BSR Mode RD 7 Mode Select 00 = Mode 0 01 = Mode 1 1x = Mode 2 WR Port_CL DO D1 D2 D3 DATA D4 BUS D5 Port A 1= INPUT 0 = OUTPUT Port CH (PC7-PC4) 1= INPUT; 0 = OUTPUT 4 Port_CH BSR AFFECTS ONLY THE 8255 7 The control register is 19h. O b. The control register is 11h. The control register is 91h. OC. The control register is 00h. d. INTEL 8253/8254/8255 3.

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
icon
Related questions
Question
The Intel 8255 processor with an 8-bit data bus is configured as shown in the figure below ( PORT_A as INPUT,
PORT_B as OUTPUT, PORT_CL as INPUT and PORT_CH as OUTPUT). Find the control register for the indicated
configuration.
HINT: Assuming not using the BSR to control PCs PORTS, only considering using the I/O MODE with a digit of 1.
A0
Port_A
7
A1
CONTROL WORD (BYTE)
D7 D6 D5 D4 D3 D2 D1 DO
? ? ? ? ? ? ? ?
Control Word
CS
Port_B
1= VO Mode
0 = BSR Mode
Port CL
(PC3-PC0)
1= INPUT; 0 = OUTPUT
RD
7
Mode Select
00 = Mode 0
01 = Mode 1
1x = Mode 2
Port B
1= INPUT; 0 = OUTPUT
WR
Mode Select
0 = Mode 0
1= mode 1
Port_CL
DO
D1
D2
D3 DATA
D4 BUS
Port A
Port CH
(PC7-PC4)
1= INPUT; 0 = OUTPUT
1 = INPUT
0 = OUTPUT
4
Port_CH
D6
BSR AFFECTS ONLY THE 8255
7
The control register is 19h.
The control register is 11h.
Ob.
The control register is 91h.
OC.
The control register is 00h.
d.
EN345ON
INTEL 8253/8254/8255
Transcribed Image Text:The Intel 8255 processor with an 8-bit data bus is configured as shown in the figure below ( PORT_A as INPUT, PORT_B as OUTPUT, PORT_CL as INPUT and PORT_CH as OUTPUT). Find the control register for the indicated configuration. HINT: Assuming not using the BSR to control PCs PORTS, only considering using the I/O MODE with a digit of 1. A0 Port_A 7 A1 CONTROL WORD (BYTE) D7 D6 D5 D4 D3 D2 D1 DO ? ? ? ? ? ? ? ? Control Word CS Port_B 1= VO Mode 0 = BSR Mode Port CL (PC3-PC0) 1= INPUT; 0 = OUTPUT RD 7 Mode Select 00 = Mode 0 01 = Mode 1 1x = Mode 2 Port B 1= INPUT; 0 = OUTPUT WR Mode Select 0 = Mode 0 1= mode 1 Port_CL DO D1 D2 D3 DATA D4 BUS Port A Port CH (PC7-PC4) 1= INPUT; 0 = OUTPUT 1 = INPUT 0 = OUTPUT 4 Port_CH D6 BSR AFFECTS ONLY THE 8255 7 The control register is 19h. The control register is 11h. Ob. The control register is 91h. OC. The control register is 00h. d. EN345ON INTEL 8253/8254/8255
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Recommended textbooks for you
Computer Networking: A Top-Down Approach (7th Edi…
Computer Networking: A Top-Down Approach (7th Edi…
Computer Engineering
ISBN:
9780133594140
Author:
James Kurose, Keith Ross
Publisher:
PEARSON
Computer Organization and Design MIPS Edition, Fi…
Computer Organization and Design MIPS Edition, Fi…
Computer Engineering
ISBN:
9780124077263
Author:
David A. Patterson, John L. Hennessy
Publisher:
Elsevier Science
Network+ Guide to Networks (MindTap Course List)
Network+ Guide to Networks (MindTap Course List)
Computer Engineering
ISBN:
9781337569330
Author:
Jill West, Tamara Dean, Jean Andrews
Publisher:
Cengage Learning
Concepts of Database Management
Concepts of Database Management
Computer Engineering
ISBN:
9781337093422
Author:
Joy L. Starks, Philip J. Pratt, Mary Z. Last
Publisher:
Cengage Learning
Prelude to Programming
Prelude to Programming
Computer Engineering
ISBN:
9780133750423
Author:
VENIT, Stewart
Publisher:
Pearson Education
Sc Business Data Communications and Networking, T…
Sc Business Data Communications and Networking, T…
Computer Engineering
ISBN:
9781119368830
Author:
FITZGERALD
Publisher:
WILEY