What did you test in your IDE. Or what code did you test in your IDE? quote]

   // PART A -- erase the FLASH page at 0x1000
   
   // initialize write/erase pointer
   pwrite = (unsigned char xdata *) 0x1000;   

   EA_save = EA;                       // save interrupt status   
   EA = 0;                             // disable interrupts (precautionary)
   
   FLSCL |= 0x01;                      // enable FLASH writes/erases from
                                       // user software
   
   PSCTL = 0x03;                       // MOVX writes erase FLASH page

   *pwrite = 0;                        // initiate page erase

   PSCTL = 0;                          // MOVX writes target XRAM
   
   FLSCL &= ~0x01;                     // disable FLASH writes/erases from
                                       // user software  
   
   EA = EA_save;                       // re-enable interrupts
   
   // PART B -- copy test string to FLASH memory at address 0x1000
   
   // initialize FLASH read pointer
   pread = (unsigned char code *) test_string;

   EA_save = EA;                       // save interrupt status
   EA = 0;                             // disable interrupts (precautionary)
   pwrite = 0x1000;                    // initialize FLASH write pointer
   
   FLSCL |= 0x01;                      // enable FLASH writes/erases from
                                       // user software
      
   PSCTL = 0x01;                       // MOVX writes target FLASH memory

   while (*pread != '\0') {            // copy until NULL is detected

      *pwrite = *pread;                // copy byte

      pread++;                         // advance pointers
      pwrite++;
   }

   *pwrite = '\0';

   PSCTL = 0x00;                       // MOVX writes target XRAM
   
   FLSCL &= ~0x01;                     // disable FLASH writes/erases from
                                       // user software   

   EA = EA_save;                       // re-enable interrupts

and

while (1)                          // spin forever
   {                          
     for (ii=0;ii<6; ii++) 
	 {
	   LED = 1;
       printf("%c",eedata[ii]);
	   printf("@13");
     }
	 printf("\x0d");
	 printf("\x0a");
	 LED = 0;
   }

and this don't work because nothing is send by uart

// PART C -- read test string to FLASH memory at address 0x1000 and copy in tab eedata

   EA_save = EA;
   EA = 0;
   pwrite = 0x1000;
   FLSCL |= 0x40;
   PSCTL = 0x00;

   while (*pread !='\0') {

     *eedata = *pread;                // copy byte

      pread++;                         // advance pointers
	  pwrite++;
   }

   PSCTL = 0x00;                       // MOVX writes target XRAM
   
   FLSCL &= ~0x40;                     // disable FLASH writes/erases from
                                       // user software   

   EA = EA_save;                       // re-enable interrupts

I don't know that. By the uart, i see no value and i suppose that my code for the reading flash memory don't work.

// PART C -- read test string to FLASH memory at address 0x1000 and copy in tab eedata

   EA_save = EA;
   EA = 0;
   pwrite = 0x1000;
   FLSCL |= 0x40;
   PSCTL = 0x00;

   while (*pread !='\0') {

     *eedata = *pread;                // copy byte

      pread++;                         // advance pointers
	  pwrite++;
   }

   PSCTL = 0x00;                       // MOVX writes target XRAM
   
   FLSCL &= ~0x40;                     // disable FLASH writes/erases from
                                       // user software   

   EA = EA_save;                       // re-enable interrupts

I hope this answers your questions

Thanks.
Regards