Introduction to MCU's logic circuit and logic operation-EEWORLD

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In digital circuits, we often encounter logic circuits, and in C language, we often use logical operations. The two are interrelated in principle.

First of all, within the concept of "logic", there are two logical values, true and false. When corresponding to digital circuits or C language, they become "non-zero value" and "0 value", that is, logically "false" is the value "0" in digital circuits or C language, and logically "true" is all other "non-zero values".

Then, let's analyze several major logical operators in detail. We assume that there are two byte variables: A and B, and the result of a certain logical operation between the two is F.

The following logical operators are all operated according to the overall value of the variable, and are usually called logical operators:

The following logical operators are all operated on each bit in the variable, and are usually called bitwise operators:

When we look at materials or chip manuals in the future, we will often encounter some circuit symbols. Figure 5-1 shows the commonly used symbols in digital circuits. Knowing these symbols will help us understand the logical structure of the device, especially the popular foreign graphic symbols in Figure 5-1. Let's take a quick look here. If you encounter them in the future, you can check them here.

Figure 5-1 Logic circuit symbol

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