Question: Why does the processor need to write the value of PC-Temp into LINK register? Subroutine call with indirection: Call_register R9 1. Memory address [PC], Read

Why does the processor need to write the value of PC-Temp

Why does the processor need to write the value of PC-Temp into LINK register? Subroutine call with indirection: Call_register R9 1. Memory address [PC], Read memory, IR- Memory data, PC 4[PC] + 4 2. Decode instruction, RA -[R9] 3. PC-Temp [PC], PC +[RA] 4. RY+- [PC-Temp] 5. Register LINK [RY]

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