CODEWITHSUNDEEP
lc3
presa
presa

Reputation: 195

How to store a value on an address line?

I need help with figuring out how do I store the value of a register (e.g. R0) on an address line that can be found on yet another register (e.g. R1):

AddressLine[R1] <- M[R0]
if R1 = x3400
then x3400 <- M[R0]

Upvotes: 1

Views: 1421

Answers (1)

aqua
aqua

Reputation: 647

You're looking for the STR instruction

STR <source register> <base register> <immediate offset>

i.e.

AND r0,r0,#0     ; clear r0
ADD r0,r0,#10    ; r0 = 10
LEA r1,MEMSPACE  ; address of MEMSPACE
STR r0,r1,#0     ; M[R1 + 0] = R0

MEMSPACE .word 0 ; will become 10

Upvotes: 1

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