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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.

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)
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...
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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
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