C51 两种对内存空间地址写数据的办法

办法一：

unsigned char volatile xdataCH375_CMD_PORT _at_ 0xBDF1;/* CH375指令端口的I/O地址 */
CH375_CMD_PORT = Data;

办法二：

*((unsigned char xdata *) 0xBDF1) = Data;

相似：DSP2407的头文件

voatile unsigned int * IMR = (volatile unsigned int *)0x0004;

*IMR = value;