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I am designing PIC16F877a based project that counts the number of people in a room and turn ON the relays in accordance with that number like if 5 persons in a room then One relay would be ON. I want user of the device to set the number according to their need therefore I want to store some integers variables (value defined by user) in a Flash memory on uC at runtime using C code. I have searched on Google but did not find any suitable answer.

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Your PIC has 256 bytes of EEPROM; you can use that to store your variables. Depending on the compiler, it may have some built-in function to read/write the EEPROM memory. – m.Alin May 12 at 8:35
@m.Alin I am using HI-TECH C compiler. What built in functions are available for it. – Farid-ur-Rahman May 12 at 8:39
unsigned char eeprom_read (unsigned int address); void eeprom_write (unsigned int address, unsigned char value); | You should include the htc.h header file – m.Alin May 12 at 8:48
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I know "Use Google" answers are frowned upon, but re: I am using HI-TECH C compiler. What built in functions are available for it. Seriously, just google "Hi-tech c pic eeprom" and the easily first 10 results are exactly what you want. – Connor Wolf May 12 at 10:46
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@Connor : that search works because you already know one search term that wasn't in the original question! – Brian Drummond May 12 at 13:21
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