Bitwise Logic Operations

In chapter 3, section 3.3, circuits and truth tables for the Boolean operations AND, OR, NOT, and XOR were discussed. The truth table for AND is

p q (p AND q)
1 1 1
1 0 0
0 1 0
0 0 0

and is implemented using the Boolean circuit

Bitwise Logic Operations

If eight of these Boolean circuits are used in parallel, then two eight-bit numbers,

    1111 0101
    1100 0011

when fed into the eight AND gates, result in one eight-bit output:

    1100 0001

The operation is carried out as shown in Figure 10-1. In hex notation, the bytes F5H and C3H used as inputs to a one-byte AND operation have produced the output C1H. This operation can be applied ...

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