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You have constructed a coffee-maker peripheral for an ARM microcontroller. The coffee-maker takes 5 minutes to finish brewing. This is longer than the longest possible interval on the ARM interval timer. Which of the options below is the best way to time a 5 minute interval? OA Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically add the timeout flag to some accumulating variable, then immediately clear the timeout flag. When the accumulating variable reaches the appropriate number of subdivisions, the coffee is done. B. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically check the low period register. When that register reaches zero, increment a counter. When the counter reaches the appropriate number of subdivisions, the coffee is done. C. Define the full 5 minute count interval as a 64-bit number (i.e. spread across two registers in assembly). Set the timer interval to the maximum value, and subtract this value from the full count interval stored in memory. Start the timer for a single count-down. After the timer has counted down for a while, periodically subtract some value from the full count interval (stored in memory) and add that value to the current timer interval (.e. "rolling it back"). When the full count interval in memory reaches zero, and the timer stops, the coffee is done. O D. It is impossible: you need a 64 bit timer or a timer with a slower clock speed.

You have constructed a coffee-maker peripheral for an ARM microcontroller. The coffee-maker takes 5 minutes to finish brewing. This is longer than the longest possible interval on the ARM interval timer. Which of the options below is the best way to time a 5 minute interval? OA Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically add the timeout flag to some accumulating variable, then immediately clear the timeout flag. When the accumulating variable reaches the appropriate number of subdivisions, the coffee is done. B. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically check the low period register. When that register reaches zero, increment a counter. When the counter reaches the appropriate number of subdivisions, the coffee is done. C. Define the full 5 minute count interval as a 64-bit number (i.e. spread across two registers in assembly). Set the timer interval to the maximum value, and subtract this value from the full count interval stored in memory. Start the timer for a single count-down. After the timer has counted down for a while, periodically subtract some value from the full count interval (stored in memory) and add that value to the current timer interval (.e. "rolling it back"). When the full count interval in memory reaches zero, and the timer stops, the coffee is done. O D. It is impossible: you need a 64 bit timer or a timer with a slower clock speed.

Database System Concepts
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
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You have constructed a coffee-maker peripheral for an ARM microcontroller. The coffee-maker takes 5 minutes to finish brewing. This is longer than the longest possible interval on the ARM interval timer. Which of the options below is the best way to time a 5 minute interval? O A. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically add the timeout flag to some accumulating variable, then immediately clear the timeout flag. When the accumulating variable reaches the appropriate number of subdivisions, the coffee is done. B. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically check the low period register. When that register reaches zero, increment a counter. When the counter reaches the appropriate number of subdivisions, the coffee is done. Define the full 5 minute count interval as a 64-bit number (i.e. spread across two registers in assembly). Set the timer interval to the maximum value, and subtract this value from the full count interval stored in memory. Start the timer for a single count-down. After the timer has counted down for a while, periodically subtract some value from the full count interval (stored in memory) and add that value to the current timer interval (i.e. "rolling it back"). When the full count interval in memory reaches zero, and the timer stops, the coffee is done. D. It is impossible: you need a 64 bit timer or a timer with a slower clock speed.
Transcribed Image Text:You have constructed a coffee-maker peripheral for an ARM microcontroller. The coffee-maker takes 5 minutes to finish brewing. This is longer than the longest possible interval on the ARM interval timer. Which of the options below is the best way to time a 5 minute interval? O A. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically add the timeout flag to some accumulating variable, then immediately clear the timeout flag. When the accumulating variable reaches the appropriate number of subdivisions, the coffee is done. B. Set the timer interval for some integer subdivision of 5 minutes. Start the timer for count-down and repeat. Periodically check the low period register. When that register reaches zero, increment a counter. When the counter reaches the appropriate number of subdivisions, the coffee is done. Define the full 5 minute count interval as a 64-bit number (i.e. spread across two registers in assembly). Set the timer interval to the maximum value, and subtract this value from the full count interval stored in memory. Start the timer for a single count-down. After the timer has counted down for a while, periodically subtract some value from the full count interval (stored in memory) and add that value to the current timer interval (i.e. "rolling it back"). When the full count interval in memory reaches zero, and the timer stops, the coffee is done. D. It is impossible: you need a 64 bit timer or a timer with a slower clock speed.
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