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3) (5) What value will the carry flag contain after these instructions: a) MOV R1,#3 MOVS R2, R1, LSR #1 b) MOV R1,#2 MOVS R2
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Answer #1

3a)
MOV R1, #3        ;will move 3 into R1 i.e. R1 = 0x00000003
MOVS R2, R1, LSR #1   ;LSR #1 will logical shift R1 contents to Right. Carry flag is replaced by shifted out bit
           ;Hence Carry Flag = 1 after LSR instruction.
           ;MOVS R2, R1 will cause data move with Carry = 1 ("S" is used to affect flags)

b)
MOV R1, #2       ; Move R1 = 0x00000002
MOVS R2, R1, LSR #1   ; Logical shifting R1 right will shift out "0" in carry flag
           ; Carry flag remains = 0

4)

To affect the condition flags in CPSR, we need ADDS instruction instead of ADD

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