temp |= 0x00011100;
时间: 2023-11-01 09:36:12 浏览: 87
As an AI language model, I cannot provide you with a specific answer without knowing the context of this code. However, in general, this line of code performs a bitwise OR operation between the variable "temp" and the hexadecimal value 0x00011100. This operation sets certain bits in the "temp" variable to 1 based on the binary representation of the hexadecimal value.
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temp |= 0x10001000;
This line of code performs a bitwise OR operation on the value of the variable "temp" with the binary value 0x10001000.
The binary value 0x10001000 is equivalent to the decimal value 268959744 in base 10.
The bitwise OR operation sets each bit of the result to 1 if either of the corresponding bits in the operands is 1.
Therefore, this line of code sets the 13th and 32nd bits of the variable "temp" to 1, while leaving all other bits unchanged.
STM32 RCC->CFGR|=0x00000002;//PLL作为系统时钟 while(temp!=0x02) //等待PLL作为系统时钟设置成功 { temp=RCC->CFGR>>2; temp&=0x03; }
这是STM32的代码,主要是设置PLL作为系统时钟,并等待PLL设置成功。具体来说,这段代码将PLL作为系统时钟,并通过循环等待确认PLL设置成功。
首先,`RCC->CFGR` 是RCC寄存器的配置寄存器,用于配置系统时钟。`CFGR|=0x00000002` 表示将PLL作为系统时钟源。
接着,进入一个循环,条件是 `temp!=0x02`。在循环体内,先读取 `RCC->CFGR`,然后将其右移两位(因为PLL的时钟源位于CFGR的位2和位3)。接着,使用位掩码操作将`temp`设置为CFGR中的PLL时钟源位,并检查其是否等于0x02。如果不是,则继续循环等待。如果是,则说明PLL已成功设置为系统时钟源,退出循环。
总的来说,这段代码的作用是确保系统时钟源已经切换到PLL,并等待PLL设置成功。