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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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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