Ret instruction lc3 instruction

 

 

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lc3 cheat sheetlc3 trap vector table
jsrr lc3
jmp instruction lc3
lc3 halt instruction
lc3 subroutine example
lc3 ret
str lc3

 

 

Data movement instructions: LD, LDI, LDR, LEA, ST, STR, STI LC-3 assembly language lets us use RET (return) in place of “JMP R7”. instruction following the subroutine? We saved old PC in R7. • JMP R7 gets us back to the user program at the right spot. C 3. RET (. ).How to use some LC3 operations: And, add, not, etc. first instruction of the subroutine, causing an add operation RET. 9-27. CSE 240. Returning From a Subroutine. The RET instruction. • Just a special case of JMP. RET == JMP R7. • Same idea as returning from TRAPs. "What important feature does JSSR provide that JSR does not?" RET instruction. RET is the same as "JMP R7". Interfacing with Subroutines. NOTE: PC has already been incremented during instruction fetch stage. 9. Returning from a Subroutine. •RET (JMP R7) gets us back to the calling routine PC < Mem[ Zext( IR[7:0] ) ]. ; the 8-bit trap vector is loaded to the PC. 0 RET – return instruction. – The TSR ends with the RET instruction. instruction following the TRAP? We saved old PC in R7. JMP R7 gets us back to the user program at the right spot. LC-3 assembly language lets us use RET

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