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Which of the following combination is the best to enable the external hardware interrupt 0 of the IE register (assuming initially all bits of the IE register are zero)?
- a)EX0=1
- b)EA=1
- c)any of the mentioned
- d)both of the mentioned
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
Which of the following combination is the best to enable the external ...
For executing the EX0 interrupt, the EX0 and EA bits of the IE register should be set. EA is set to enable all the interrupts and EX0 is set to enable the external hardware interrupt 0 interrupt and mask the other enabled interrupts.
Most Upvoted Answer
Which of the following combination is the best to enable the external ...
The correct answer is option 'D', which means that both options 'a' and 'b' are required to enable the external hardware interrupt 0 of the IE register.
Explanation:
To understand why both options 'a' and 'b' are required, let's first understand the IE register and its bits:
The IE (Interrupt Enable) register is a special register in a microcontroller or microprocessor that is used to enable or disable interrupts. It typically contains several bits, each corresponding to a specific interrupt source. In this case, we are interested in enabling the external hardware interrupt 0.
The external hardware interrupt 0, also known as INT0, is a hardware interrupt input pin that can trigger an interrupt when its state changes from high to low. It is commonly used to handle external events or signals.
Now, let's analyze each option:
a) EX0=1:
The EX0 bit is a bit in the IE register that is specifically associated with the external hardware interrupt 0. Setting this bit to 1 enables the external hardware interrupt 0. However, this alone is not enough to enable the interrupt. It only enables the interrupt source but doesn't globally enable all interrupts.
b) EA=1:
The EA bit is another bit in the IE register that stands for "Enable All Interrupts". Setting this bit to 1 globally enables all interrupts. This means that even if EX0 is set to 1, the external hardware interrupt 0 will not be recognized unless EA is also set to 1.
Combining options 'a' and 'b':
To enable the external hardware interrupt 0, we need to set both the EX0 and EA bits to 1. This allows the microcontroller or microprocessor to recognize the interrupt signal on the INT0 pin and handle it accordingly.
Therefore, the correct combination to enable the external hardware interrupt 0 is to set both the EX0 and EA bits to 1.
Explanation:
To understand why both options 'a' and 'b' are required, let's first understand the IE register and its bits:
The IE (Interrupt Enable) register is a special register in a microcontroller or microprocessor that is used to enable or disable interrupts. It typically contains several bits, each corresponding to a specific interrupt source. In this case, we are interested in enabling the external hardware interrupt 0.
The external hardware interrupt 0, also known as INT0, is a hardware interrupt input pin that can trigger an interrupt when its state changes from high to low. It is commonly used to handle external events or signals.
Now, let's analyze each option:
a) EX0=1:
The EX0 bit is a bit in the IE register that is specifically associated with the external hardware interrupt 0. Setting this bit to 1 enables the external hardware interrupt 0. However, this alone is not enough to enable the interrupt. It only enables the interrupt source but doesn't globally enable all interrupts.
b) EA=1:
The EA bit is another bit in the IE register that stands for "Enable All Interrupts". Setting this bit to 1 globally enables all interrupts. This means that even if EX0 is set to 1, the external hardware interrupt 0 will not be recognized unless EA is also set to 1.
Combining options 'a' and 'b':
To enable the external hardware interrupt 0, we need to set both the EX0 and EA bits to 1. This allows the microcontroller or microprocessor to recognize the interrupt signal on the INT0 pin and handle it accordingly.
Therefore, the correct combination to enable the external hardware interrupt 0 is to set both the EX0 and EA bits to 1.
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Which of the following combination is the best to enable the external hardware interrupt 0 of the IE register (assuming initially all bits of the IE register are zero)?a)EX0=1b)EA=1c)any of the mentionedd)both of the mentionedCorrect answer is option 'D'. Can you explain this answer?
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