摸索了快1个月，我还是不懂如何访问片外RAM地址。
上次发贴请教时，记得strongchen 版主说过访问片外RAM与访问片内RAM方式是一样的，于是我先弄懂访问片内RAM地址的办法，编写程序访问片内RAM 0x2000-0x2005地址如下：
unsigned int *ramaddr;
unsigned int a,b,c, x,y,z;
void main(void)
{
/*** Processor Expert internal initialization. DON'T REMOVE THIS CODE!!! ***/
PE_low_level_init();
/*** End of Processor Expert internal initialization. ***/
/* Write your code here */
for(;;)
{
a=10;
b=20;
c=30;
ramaddr=(volatile unsigned int*)(0x3000);
*ramaddr=a;
*ramaddr++;
*ramaddr=b;
*ramaddr++;
*ramaddr=c;
z=*ramaddr;
*ramaddr--;
y=*ramaddr;
*ramaddr--;
x=*ramaddr;
}
/*** Processor Expert end of main routine. DON'T MODIFY THIS CODE!!! ***/
for(;;){}
/*** Processor Expert end of main routine. DON'T WRITE CODE BELOW!!! ***/
} /*** End of main routine. DO NOT MODIFY THIS TEXT!!! ***/
该程序执行后x=10,y=20,z=30，成功！
接着我修改程序让它访问外部RAM：
把 ramaddr=(volatile unsigned int*)(0x3000)
改成ramaddr=(volatile unsigned int*)(0x108000)
理所当然地想这下可以访问0x10页的0x8000－0x8005了，但是执行结果失败了！
我又试着改成这个样子：
PPAGE=0x10;
ramaddr=(volatile unsigned int*)(0x8000);
单步执行时候程序跳进Start12.c中死了！
另外我还试过许许多多的其他办法，仍然失败，我实在没主意了，请各位大侠帮帮小弟我！ | 
