If the crystal frequency is 4.5 MHz, determine the time for setting the timer flag for mode 3 if count in TH0 is 9CH.
Question
If the crystal frequency is 4.5 MHz, determine the time for setting the timer flag for mode 3 if count in TH0 is 9CH.
Solution
To solve this problem, we need to follow these steps:
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First, we need to understand that in mode 3, the Timer 0 is an 8-bit auto-reload timer/counter. This means that it will count from the value in TH0 to 255 and then automatically reload the value in TH0 and continue counting.
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The value 9CH is a hexadecimal number. Converting it to decimal, we get 156.
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The timer will count from 156 to 255. The number of counts is therefore 255 - 156 = 99.
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The crystal frequency is 4.5 MHz. This is the number of oscillations per
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