D:\Prg\C2CW\TEST\minF877\eeprom.c

Read/write eeprom routines for PIC16F877

// write & read EEPROM routines (for 16F877)

// Author : Joan Ilari - e-mail: c2c@ilari.org

void write_eeprom ( char addr, char data )
{        //---- Write eeprom -----

while ( _EECON1 & _WR);                // check completion of last write
_EEADR = addr;                        // set address register
_EEDATA = data;                        // set data register
clear_bit ( _EECON1, EEPGD );
set_bit( _EECON1, WREN );
_EECON2 = 0x55;
_EECON2 = 0xAA;
set_bit( _EECON1, WR );                // write command
clear_bit( _EECON1, WREN );        // inhibit further writing
}

char read_eeprom ( char addr )
{        //---- Read eeprom -----

_EEADR = addr;                        // set address register
clear_bit ( _EECON1, EEPGD );
set_bit( _EECON1, RD );                // read command
return (_EEDATA);
}