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Consider an 8-pin general purpose input/output port memory mapped to address adr_gpio_a. What does the following code de ldr r®, adr_gpio_a ldr r1, =0xfb str r1, [r®, #4] ldr r2, [r®] A. Sets pin 2 as input, the remaining pins (0,1, 3.7) as output, then reads from pin 2. O B. Sets pin 2 as output, the remaining pins (0,1, 3..7) as input, then reads from every pin except pin 2. C. Writes the value Oxfb to the memory cell adjacent to the i/o port, then reads input from all of the pins in the port. D. Reads the input from the i/o port and applies a bit mask of 0xfb.

Consider an 8-pin general purpose input/output port memory mapped to address adr_gpio_a. What does the following code de ldr r®, adr_gpio_a ldr r1, =0xfb str r1, [r®, #4] ldr r2, [r®] A. Sets pin 2 as input, the remaining pins (0,1, 3.7) as output, then reads from pin 2. O B. Sets pin 2 as output, the remaining pins (0,1, 3..7) as input, then reads from every pin except pin 2. C. Writes the value Oxfb to the memory cell adjacent to the i/o port, then reads input from all of the pins in the port. D. Reads the input from the i/o port and applies a bit mask of 0xfb.

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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Consider an 8-pin general purpose input/output port memory mapped to address adr_gpio_a . What does the following code do? ldr re, adr_gpio_a ldr r1, =0xfb str r1, [r®, #4] ldr r2, [r®] A. Sets pin 2 as input, the remaining pins (0,1, 3..7) as output, then reads from pin 2. B. Sets pin 2 as output, the remaining pins (0,1, 3..7) as input, then reads from every pin except pin 2. C. Writes the value Oxfb to the memory cell adjacent to the i/o port, then reads input from all of the pins in the port. D. Reads the input from the i/o port and applies a bit mask of Oxfb.
Transcribed Image Text:Consider an 8-pin general purpose input/output port memory mapped to address adr_gpio_a . What does the following code do? ldr re, adr_gpio_a ldr r1, =0xfb str r1, [r®, #4] ldr r2, [r®] A. Sets pin 2 as input, the remaining pins (0,1, 3..7) as output, then reads from pin 2. B. Sets pin 2 as output, the remaining pins (0,1, 3..7) as input, then reads from every pin except pin 2. C. Writes the value Oxfb to the memory cell adjacent to the i/o port, then reads input from all of the pins in the port. D. Reads the input from the i/o port and applies a bit mask of Oxfb.
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