PIC18F66K22-I Datasheet, PDF (136/550 Pages) Microchip Technology – PIC18F87K22 Family Data Sheet

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