You´re right. Belive me, I spent to much time in this matter.

I have no problem using this code into Atmel AT89S8252 but it does not work with W77e58.

Here is the code.

#include<string.h>
#include<W77E58.h>


unsigned char xdata xdata_buffer [1];


void main(void){
TA = 0xAA; /*W77e58 Time Accessed Functions*/
TA = 0x55;
memcpy (xdata_buffer, "2", sizeof (xdata_buffer));
}

Thanks again.