stm32初始化FM25W256

傷城~ 2022-12-25 13:51 174阅读 0赞

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**1**.WREN-在任何写操作之前发出，会导致内部写锁存被设置，状态寄存器中一个标志位，称为WEL，表示锁存的状态。**任何写操作会自动清除写锁存**。  
**2.WRSR-允许用户向状态寄存器写一个字节，在WRSR写之前，/WP**必须高位或者不动。  
在发送WRSR之前，必须发送一个WERN命令来启动写操作，执行WRSR后会清除写锁存。

**写状态寄存器：**  
![在这里插入图片描述][2020120213572184.png]  
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![在这里插入图片描述][20201202094921928.png]  
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**\}**  
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**FM25W256的写保护状态寄存器**  
WREN:0000 0110b; //写使能命令  
WRSR:0000 0001b; //写保护状态寄存器命令  
WRITE:0000 0010b //写 命令  
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![在这里插入图片描述][20201202165650893.png]  
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必须先发送WREN–使能写，然后发送WRSR+数据（Status Register的值）。

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**向FM25W256写入数据**  
先写保护状态，**0x80**表示没有保护的内存。  
先发送**WREN**,然后**WRITE+两字杰的地址+两个字节的数据**（低前高后）。  
最后写**0x8C**,保护所有的内存，所有的都不能改动。  
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向FM25W256写入数据，把16位的数据分位两位，低前高后。  
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**读取FM25w256**  
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