推荐回答(4个)
读 一般是没次数限制的,只有 写 才有次数限制
一个字节有8位 11111111
写入前要先擦除 将8位置1
如果某个位损坏了 它将无法恢复到1
例如 001100101 65H 擦除之后
正常是 11111111 FFH 但第一位坏了变成了
11111110 FEH
然后你要写入 81H 10000001 实际它是变成了10000000 80H
这就不正确了
写入操作只能1变0 ,0不能变1
但是如果你要写入的是 80H 10000000的话
那样即使第1位损坏了 同样是能得到正确的结果
但是使用中我们无法辨别哪个位损坏了,所以读出来的数据还是不确定
上面的回答说“不管写入什么数据,读出来的数据是不确定的”
这不一定的,如: 写入"00H"00000000的话 读出来是不会错的
如: 写入"FFH"11111111,有"位"损坏的话读出来的结果就绝对是错的
这就跟低级格式化硬盘相似 全部数据置0
要测试那个位损坏可以先全部数据置0 然后擦除恢复1
哪个位不能恢复成1就是坏了
也就是全部字节写00H 然后擦除恢复为FFH
哪个擦除之后不是FF就是那个字节的位有损坏
STC单片机的EEPROM一般都有很多个扇区
可以通过检测扇区损坏 使用另外一个扇区
应该是 不管 写入 什么数据,读出来的 数据 是 不确定的,这是因为 EEPROM 使用老化的损坏也是 不确定 那个 位 不好。
如果坏了,写入的数据无论是什么,读出来都是一样的数据,或者根本读不出来数据
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