【转】Why we use #pragma configs in PIC controllers?

最新推荐文章于 2024-08-24 14:54:02 发布

sllin

最新推荐文章于 2024-08-24 14:54:02 发布

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分类专栏： # PIC

本文链接：https://blog.youkuaiyun.com/sllin/article/details/109670490

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pragma配置在PIC控制器中存储在独立的闪存区域，确保在程序执行前即可设置，例如选择时钟源、保护代码等。它们是编译器指令，优先于常规C代码处理，用于设置启动时的引脚状态、时钟频率等。了解这些配置有助于根据需求正确设定PIC的工作模式。

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These #pragma configs configure settings which live in their own section of flash memory that is outside of your program code. They are available as soon as the PIC gets power, regardless where they are written in your code. This is important because sometimes they are needed before your program is executed.

For example, there are settings to select a clock source and convert it to the actual clock of your PIC. This can't be done in your program code because the clock must correctly configured before your code can run.

Another example is the code protection setting. If this is enabled, it is not possible to read the program memory of the PIC with a programmer. This discourages others from copying program memory and reverse-engineering your code. This can't be done with program code because it's possible put your PIC into programming mode before any of you program code executes, bypassing anything that enables code protection. In this way