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6. Suppose the SysTick interrupt occurs when PC = 0x08000044, XPSR = 0x00000020, SP = 0x20000200, LR = 0x08001000, and Ri=i (i = 0, 1, 2, ..., 12). Memory Address 0x08000044 0x0800001C 0x0800001E 0x08000020 Instruction main PROC MOV r3,#0 ENDP SysTick_Handler PROC EXPORT SysTick_Handler ADD r3, #1 ADD r4, #1 BX Ir ENDP a. Show the stack content and the value of PC and SP when immediately entering the SysTick interrupt service routine. b. When executing the instruction "BX LR", how does the processor know whether it is exiting a standard subroutine or an interrupt service routine? What operations are performed when exiting a standard subroutine? What operations are performed when exiting an interrupt service routine?

6. Suppose the SysTick interrupt occurs when PC = 0x08000044, XPSR = 0x00000020, SP = 0x20000200, LR = 0x08001000, and Ri=i (i = 0, 1, 2, ..., 12). Memory Address 0x08000044 0x0800001C 0x0800001E 0x08000020 Instruction main PROC MOV r3,#0 ENDP SysTick_Handler PROC EXPORT SysTick_Handler ADD r3, #1 ADD r4, #1 BX Ir ENDP a. Show the stack content and the value of PC and SP when immediately entering the SysTick interrupt service routine. b. When executing the instruction "BX LR", how does the processor know whether it is exiting a standard subroutine or an interrupt service routine? What operations are performed when exiting a standard subroutine? What operations are performed when exiting an interrupt service routine?

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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6. Suppose the SysTick interrupt occurs when PC = 0x08000044, XPSR = 0x00000020, SP = 0x20000200, LR = 0x08001000, and Ri = i (i = 0, 1, 2, ..., 12). Memory Address 0x08000044 0x0800001C 0x0800001E 0x08000020 Instruction main PROC MOV r3,#0 ENDP SysTick_Handler PROC EXPORT SysTick_Handler ADD r3, #1 ADD r4, #1 BX Ir ENDP a. Show the stack content and the value of PC and SP when immediately entering the SysTick interrupt service routine. b. When executing the instruction "BX LR", how does the processor know whether it is exiting a standard subroutine or an interrupt service routine? What operations are performed when exiting a standard subroutine? What operations are performed when exiting an interrupt service routine?
Transcribed Image Text:6. Suppose the SysTick interrupt occurs when PC = 0x08000044, XPSR = 0x00000020, SP = 0x20000200, LR = 0x08001000, and Ri = i (i = 0, 1, 2, ..., 12). Memory Address 0x08000044 0x0800001C 0x0800001E 0x08000020 Instruction main PROC MOV r3,#0 ENDP SysTick_Handler PROC EXPORT SysTick_Handler ADD r3, #1 ADD r4, #1 BX Ir ENDP a. Show the stack content and the value of PC and SP when immediately entering the SysTick interrupt service routine. b. When executing the instruction "BX LR", how does the processor know whether it is exiting a standard subroutine or an interrupt service routine? What operations are performed when exiting a standard subroutine? What operations are performed when exiting an interrupt service routine?
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