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Every rotation of a motor causes a switch to be pushed. The switch, like most mechanical switches, "clatters' or bounces when the contacts come together, causing an interval when a single press causes multiple closures. This bouncing can continue for just under 3 milliseconds. The switch is linked into the memory map of a 68000 processor at bit O of location SFFFFF000. It is connected so that the bit will read a l'when the switch is open, and a 0' when closed and not bouncing. The bouncing will cause alternating zeros and ones. For ease of any analysis you do, assume that every instruction takes 1 usec., regardless of addressing mode. Write a commented program that continuously counts the number of times the switch is pushed. It must ignore the bouncing of the switch. This is all your program needs to do; don't worry about other functions that the 68000 may have to perform at this point.

Every rotation of a motor causes a switch to be pushed. The switch, like most mechanical switches, "clatters' or bounces when the contacts come together, causing an interval when a single press causes multiple closures. This bouncing can continue for just under 3 milliseconds. The switch is linked into the memory map of a 68000 processor at bit O of location SFFFFF000. It is connected so that the bit will read a l'when the switch is open, and a 0' when closed and not bouncing. The bouncing will cause alternating zeros and ones. For ease of any analysis you do, assume that every instruction takes 1 usec., regardless of addressing mode. Write a commented program that continuously counts the number of times the switch is pushed. It must ignore the bouncing of the switch. This is all your program needs to do; don't worry about other functions that the 68000 may have to perform at this point.

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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Every rotation of a motor causes a switch to be pushed. The switch, like most mechanical switches, 'eclatters' or bounces when the contacts come together, causing an interval when a single press causes multiple elosures. This bouncing can continue for just under 3 milliseconds. The switch is linked into the memory map of a 68000 processor at bit o of location SFFFFF000. It is connected so that the bit will read a l'when the switch is open, and a *0' when closed and not bouncing. The bouncing will cause alternating zeros and ones. For ease of any analysis you do, assume that every instruction takes 1 usec., regardless of addressing mode. Write a commented program that continuously counts the number of times the switch is pushed. It must ignore the bouncing of the switch. This is all your program needs to do; don't worry about other functions that the 68000 may have to perform at this point.
Transcribed Image Text:Every rotation of a motor causes a switch to be pushed. The switch, like most mechanical switches, 'eclatters' or bounces when the contacts come together, causing an interval when a single press causes multiple elosures. This bouncing can continue for just under 3 milliseconds. The switch is linked into the memory map of a 68000 processor at bit o of location SFFFFF000. It is connected so that the bit will read a l'when the switch is open, and a *0' when closed and not bouncing. The bouncing will cause alternating zeros and ones. For ease of any analysis you do, assume that every instruction takes 1 usec., regardless of addressing mode. Write a commented program that continuously counts the number of times the switch is pushed. It must ignore the bouncing of the switch. This is all your program needs to do; don't worry about other functions that the 68000 may have to perform at this point.
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