yoyobbs 发表于 2013-6-14 22:46

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Microchip MPLAB XC8 C Compiler V1.12

2013-6-26 16:50 上传

本帖最后由 1125526801 于 2013-6-26 20:04 编辑

1125526801 发表于 2013-6-26 18:44

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2013-6-26 19:52 上传

1. 
   
2. void EEPROM_write(uchar add,uchar dat)//add为0x00~0xff
   
3. {
   
4. 
   
5.         EEADRL = add;        //地址写入EEADRL 寄存器
   
6.         EEDATL = dat;        //将数据写入EEDATL 寄存器
   
7.        
   
8.         CFGS = 0;//EECON1
   
9.         EEPGD = 0;
   
10.         WREN = 1;
    
11.         GIE = 0;
    
12. //对写操作进行解锁
    
13.         EECON2 = 0x55;  //先将 55h 写入 EECON2，
    
14.         EECON2 = 0xaa;  //随后将 AAh 写入 EECON2
    
15.         WR = 1;
    
16.         GIE = 1;
    
17.         WREN = 0;
    
18.         while(WR);//Wait for write to complete
    
19. }
    

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The unlock sequence is outlined in the datasheet. Other peripherals (like RTCC) have similiar mechanism to prevent accidental write to them. You should implement that in assembly (as there are fairly strict timing requirements for those sequences that your compiler may not be able to meet), and repeat the sequence until a write is successful.

This is an example of why reading the datasheet is invaluable.

You cannot be a good embedded programmer if you cannot read and more importantly understand the datasheet.

本帖最后由 1125526801 于 2013-6-27 09:00 编辑

millwood0 发表于 2013-6-26 20:20
This is an example of why reading the datasheet is invaluable.

You cannot be a good embedded progra ...

I  read it, but I  don't understand because thar text description for sequence is not very clear. and I cannot read assembly language,it is a big drawback for me.

In the PIC datasheet, all the examples are written in assembly language.