An 8-bit register contains the binary value 2_1001.1100 where the 0^th bit (leas

Question

An 8-bit register contains the binary value 2_1001.1100 where the 0^th bit (least significant) is 0 and the 7th bit (most significant) is 1. Note the dot (.) is added for readability of the binary value should be ignored. For a) and b) below, determine the 8-bit mask value and final register value after executing the mask: AND mask that will clear all even bits (assume bit-0 is even) OR mask that will set bits 3:0 (3 through 0) If we needed to force bits 5:4 (5 and 4) to logic low, what mask value and operation would we need to use?

Explanation / Answer

Given binary word is

1001.1100

a) AND mask to clear even bits (i.e., set to low)

7654.3210 (bit position)

1001.1100

1010.1010 (AND operation)

1000.1000 (Result)

b) OR mask to 3 to 0 bits to set

7654.3210 (bit position)

1001.1100

0000. 1111(OR operation)

1001.1111(Result)

c) for resetting bits 5 and 4 we should use AND mask

7654.3210 (bit position)

1001.1100

1100.1111 (AND operation)

1000.1100 (Result)

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