MSP430F149 flash操作时钟疑问

wateras1

MSP430F149 flash操作时钟疑问 [复制链接]

最近用MSP430F149做项目，发现一个奇怪的问题，我看官方的flash时钟范围在
Write and erase operations are controlled by the flash timing generator shown
in Figure 5−3. The flash timing generator operating frequency, f (FTG) , must be

in the range from ~ 257 kHz to ~ 476 kHz (see device-specific datasheet).



但问题是选择的时钟是MCLK(8M)，二分频竟然成功了，如果按照官方的文档要求，那需要配置24分频才对。希望知道原因的朋友帮忙解释下，下面是我的测试代码




for(i=0;i<10;i++)

{

        flash_erase((uint8*)0x1080);//擦除指定地址flash

        flash_write((uint8*)0x1080, &i, 1);//向某flash地址写入数据

        flash_read((uint8*)0x1080, &data2, 1,1);//从flash中特定地址读取数据

        if(i==data2)

        {

          printf("ok\n");



        }

        else

        {

         printf("error\n");

          

        }           

}





void bsp_flash_init(void)//片上flash初始化

{

        FCTL2 = FWKEY + FSSEL_1+FN3+FN4;// FN0; // MCLK/2 for Flash Timing Generator

}

huixianfxt

去官网看看这个文件“MSP430 Flash Memory Characteristics ”，里面有说明：
Programming the flash with a flash timing generator frequency outside the data-sheet specifications may give correct results at first but can lead to reduced data-retention time and affect flash reliability. Not following the cumulative programming time parameter may also result in bit failures and generally reduced reliability of the MSP430 flash memory. 还是按照给的参数范围配置为好！个人理解！

wateras1

huixianfxt 发表于 2015-5-21 18:53
去官网看看这个文件“MSP430 Flash Memory Characteristics ”，里面有说明：
Programming the flash with a flash timing generator frequency outside the data-sheet specifications may give correct results at first but can lead to reduced data-retention time and affect flash reliability. Not following the cumulative programming time parameter may also result in bit failures and generally reduced reliability of the MSP430 flash memory. 还是按照给的参数范围配置为好！个人理解！

多谢解答！这个问题也是困惑我挺久的。