Datasheet

PIC18F87K22 FAMILY
DS39960D-page 136  2009-2011 Microchip Technology Inc.
EXAMPLE 9-1: DATA EEPROM READ
EXAMPLE 9-2: DATA EEPROM WRITE
MOVLW DATA_EE_ADDRH ;
MOVWF EEADRH ; Upper bits of Data Memory Address to read
MOVLW DATA_EE_ADDR ;
MOVWF EEADR ; Lower bits of Data Memory Address to read
BCF EECON1, EEPGD ; Point to DATA memory
BCF EECON1, CFGS ; Access EEPROM
BSF EECON1, RD ; EEPROM Read
NOP
MOVF EEDATA, W ; W = EEDATA
MOVLW DATA_EE_ADDRH ;
MOVWF EEADRH ; Upper bits of Data Memory Address to write
MOVLW DATA_EE_ADDR ;
MOVWF EEADR ; Lower bits of Data Memory Address to write
MOVLW DATA_EE_DATA ;
MOVWF EEDATA ; Data Memory Value to write
BCF EECON1, EEPGD ; Point to DATA memory
BCF EECON1, CFGS ; Access EEPROM
BSF EECON1, WREN ; Enable writes
BCF INTCON, GIE ; Disable Interrupts
MOVLW 0x55 ;
Required MOVWF EECON2 ; Write 55h
Sequence MOVLW 0xAA ;
MOVWF EECON2 ; Write 0AAh
BSF EECON1, WR ; Set WR bit to begin write
BTFSC EECON1, WR ; Wait for write to complete GOTO $-2
BSF INTCON, GIE ; Enable Interrupts
; User code execution
BCF EECON1, WREN ; Disable writes on write complete (EEIF set)