Solve Question 30, 31 showing detailly all the steps with including all explanationsAnswer Should be typewritten using a computer keyboard! 30. A(n).occurs when there is a hardwarefault in a systemA InterruptB Spocling€ BreakerD Pipcline31.The number of comparisons done by sequentialsearch isA (N/2) +1B- (N+1)/2C (N-1)/2D (N+2)/2

Answered: 30. A(n). occurs when there is a…

30. A(n). occurs when there is a hardware fault in a system A Interrupt B Spooling € Breaker D Pipeline 31.The number of comparisons done by sequential search is A (N/2) +1

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Write an AVR C-program that uses external interrupt INT0 and Timer1 output compare interrupt to implement a one-second one-digit stop clock. The stop clock should operate as follows: When the circuit is powered on, it should display “0” continuously. When the push button is pressed, the counter should start counting from “0” – “9” at a rate of one second. When the count reaches “9”, it should reset to “0” and continue counting. If the push button is pressed again (the second time after power-on), the counter should stop at the last digit that was displayed. If the push button is pressed for a third time, the counter should continue counting from the number that was on display.
Write an AVR C-program that uses external interrupt INT0 and Timer1 output compare interrupt to implement a one-second one-digit stop clock. The stop clock should operate as follows: When the circuit is powered on, it should display “0” continuously. When the push button is pressed, the counter should start counting from “0” – “9” at a rate of one second. When the count reaches “9”, it should reset to “0” and continue counting. If the push button is pressed again (the second time after power-on), the counter should stop at the last digit that was displayed. If the push button is pressed for a third time, the counter should continue counting from the number that was on display.
A typical device for expanding the 8051 ports is the 8255A Programmable PeripheralInterface.i) Provide a functional description of the 8255A Programmable Peripheral Interfacedevice, describing the sequence of steps necessary to permit writing to the uppernibble of Port C (CU) and reading from the 8255A’s lower nibble of Port C. ii) If both Port A and Port B are used for output and Port C is used as described inpart (i) above, state the value that should be placed in the 8255A control register. iii) Assuming Port C can only be read in a byte-wise manner into the 8051accumulator, state how you would remove the influence of the upper nibble whenperforming a comparison test. Provide a suitable assembly language statement toachieve this.
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