Write one or more ARM instructions that will clear bits 20 to 25 inclusive in register r0. All the other bits of r0 should remain unchanged.
What will be an ideal response?
We could do this in many ways. You could set up a constant 0000001111110000000000000000000 = 0x03F00000
and use it as a mask with BIC. That is;
LDR r0, = 0x03F00000 ;set up the mask bits
BIC r1,r1,r0 ;clear bits with mask set to 1
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What will be an ideal response?