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WRITING TO EXTERNAL MEMORY

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

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