7.2.4 - What bit positions (7 to 0) in R4 will be toggled when the following XOR operation is executed? xor.b #01111110b, R4 0 1, 2, 3, 4, 5, and 6 7 0 and 7

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### XOR Operation and Bit Toggling

**Question:**

7.2.4 - What bit positions (7 to 0) in R4 will be toggled when the following XOR operation is executed?

```
xor.b #01111110b, R4
```

**Options:**

- ☐ 0
- ☐ 1, 2, 3, 4, 5, and 6
- ☐ 7
- ☐ 0 and 7

**Explanation:**

The XOR operation (exclusive or) compares each bit of the contents of R4 with the corresponding bit of the given constant `01111110` (in binary). It sets the result bit to `1` if the bits being compared are different, and to `0` if they are the same.

Given the constant `01111110` (binary):

```
Bit positions: 7 6 5 4 3 2 1 0
Constant:      0 1 1 1 1 1 1 0
```

- The bit positions that have a `1` in the binary constant will be toggled in R4.
- In this case, bit positions 1 through 6 will be toggled.

Thus, the correct option is:

☐ 1, 2, 3, 4, 5, and 6
Transcribed Image Text:### XOR Operation and Bit Toggling **Question:** 7.2.4 - What bit positions (7 to 0) in R4 will be toggled when the following XOR operation is executed? ``` xor.b #01111110b, R4 ``` **Options:** - ☐ 0 - ☐ 1, 2, 3, 4, 5, and 6 - ☐ 7 - ☐ 0 and 7 **Explanation:** The XOR operation (exclusive or) compares each bit of the contents of R4 with the corresponding bit of the given constant `01111110` (in binary). It sets the result bit to `1` if the bits being compared are different, and to `0` if they are the same. Given the constant `01111110` (binary): ``` Bit positions: 7 6 5 4 3 2 1 0 Constant: 0 1 1 1 1 1 1 0 ``` - The bit positions that have a `1` in the binary constant will be toggled in R4. - In this case, bit positions 1 through 6 will be toggled. Thus, the correct option is: ☐ 1, 2, 3, 4, 5, and 6
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