Iam working cygnal microcontrollers, i have declared the following statement before the main , iwant to write data to external memory. i have declared as follows before the main char xdata test_string[100] _at_ 0x5555; my requirements includes as follows. assume if iwant to write 0xf6 into test string at location 0x5555 how i have to write it.when i tried like this test_string[100]=0xf6; but its not writing kindly suggest me