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IPEN is set (IPEN = 1). Choose the correct statement(s) from the following list: O The INTO external interrupt is always a high-priority interrupt. High-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. WREG, STATUS and BSR registers are saved to the corresponding built-in shadow registers regardless of whether a high-priority or a low-priority interrupt is triggered. When a high-priority ISR interrupts a low-priority ISR, the return address to the low priority ISR cannot be stored due the limited space in the hardware stack. For this reason, once the high-priority ISR completes, PC will be immediately redirected to the main program. O retfie re-enables GIE and loads the content of TOS to PC. O Low-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. O Timer 0 interrupt is always a high-priority interrupt. WREG, STATUS and BSR registers must be saved and restored regardless of whether a high-priority or a low- priority interrupt is triggered.

IPEN is set (IPEN = 1). Choose the correct statement(s) from the following list: O The INTO external interrupt is always a high-priority interrupt. High-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. WREG, STATUS and BSR registers are saved to the corresponding built-in shadow registers regardless of whether a high-priority or a low-priority interrupt is triggered. When a high-priority ISR interrupts a low-priority ISR, the return address to the low priority ISR cannot be stored due the limited space in the hardware stack. For this reason, once the high-priority ISR completes, PC will be immediately redirected to the main program. O retfie re-enables GIE and loads the content of TOS to PC. O Low-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. O Timer 0 interrupt is always a high-priority interrupt. WREG, STATUS and BSR registers must be saved and restored regardless of whether a high-priority or a low- priority interrupt is triggered.

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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IPEN is set (IPEN = 1). Choose the correct statement(s) from the following list: %3D O The INTO external interrupt is always a high-priority interrupt. O High-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. O WREG, STATUS and BSR registers are saved to the corresponding built-in shadow registers regardless of whether a high-priority or a low-priority interrupt is triggered. O When a high-priority ISR interrupts a low-priority ISR, the return address to the low priority ISR cannot be stored due the limited space in the hardware stack. For this reason, once the high-priority ISR completes, PC will be immediately redirected to the main program. O retfie re-enables GIE and loads the content of TOS to PC. O Low-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. Timer 0 interrupt is always a high-priority interrupt. O WREG, STATUS and BSR registers must be saved and restored regardless of whether a high-priority or a low- priority interrupt is triggered.
Transcribed Image Text:IPEN is set (IPEN = 1). Choose the correct statement(s) from the following list: %3D O The INTO external interrupt is always a high-priority interrupt. O High-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. O WREG, STATUS and BSR registers are saved to the corresponding built-in shadow registers regardless of whether a high-priority or a low-priority interrupt is triggered. O When a high-priority ISR interrupts a low-priority ISR, the return address to the low priority ISR cannot be stored due the limited space in the hardware stack. For this reason, once the high-priority ISR completes, PC will be immediately redirected to the main program. O retfie re-enables GIE and loads the content of TOS to PC. O Low-priority ISRS cannot use retfie 1 to correctly restore the values of the WREG, STATUS and BSR registers. Save and restoration of these registers must be done through dedicated registers declared in software. Timer 0 interrupt is always a high-priority interrupt. O WREG, STATUS and BSR registers must be saved and restored regardless of whether a high-priority or a low- priority interrupt is triggered.
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