讀寫PIC18F452內(nèi)部EEPROM的實(shí)例源程序

?list p=18f452
???? ＃i nclude
;??
;---- 18F452 RAM LOCATIONS ------
Data_EE_Addr?? EQU?? 0X000
Data_EE_Data?? EQU?? 0X001
EEPROM_Buffer equ? 0x02
;--------VECTORS------------

? org? 0x00??
??????? bra???? START

;-------PROGRAM--------------
??
??????? org? 0x20
START
??????? rcall?? INIT
;
;----?? Test the WRITE EEPROM Routine ----
;
? clrf Data_EE_Addr ; set EEPROM start address at 0x00
? movlw '0'??? ; Load a ASCII code "0" to W
? movwf Data_EE_Data
EE_Write
? rcall IN_DATA_EEW
? incf Data_EE_Data,F ; 0x30+ N
? incf Data_EE_Addr,F? ; Point to next EEPROM Address
? btfss Data_EE_Addr,5 ; Write 32 bytes ?
? goto EE_Write
;
;----?? Test the READ EEPROM Routine ----
;
? clrf FSR0H?? ; Set RAM point to 0x010
? movlw 0x10
? movwf FSR0L
;?
? clrf Data_EE_Addr
EE_Read
? rcall READ_EEPROM
? movwf POSTINC0? ; move W --> RAM then point + 1
;
? incf Data_EE_Addr,F? ; Point to next EEPROM Address
? btfss Data_EE_Addr,5 ; Read 32 bytes ?
? goto EE_Read
;
LSTOP?????
??????? GOTO?? LSTOP????????
;
;------ INTERNAL EEPROM READ ------
;
READ_EEPROM
? movff Data_EE_Addr,EEADR
;
;?????? bcf???? INTCON,GIE?
? bcf? EECON1,EEPGD
? bsf? EECON1,RD
? movf EEDATA,W
;?????? bsf???? INTCON,GIE?
? return
;
;----INTERNAL EEPROM WRITE-----
;
IN_DATA_EEW
???????? movff? Data_EE_Addr,EEADR
???????? movff? Data_EE_Data,EEDATA
;
???????? BCF???? EECON1,EEPGD
???????? BCF??? EECON1,CFGS?? ; There are difference with data sheet
?????
;???????? BCF???? INTCON,GIE??
???????????
???????? BSF???? EECON1,WREN
;?
???????? MOVLW?? 0X55
???????? MOVWF?? EECON2
???????? MOVLW?? 0XAA
???????? MOVWF?? EECON2?????
???????? BSF??? EECON1,WR
;????????
;???????? BSF?? INTCON,GIE

LOOP1??? BTFSS?? PIR2, EEIF
???????? GOTO??? LOOP1
;
???????? BCF??? EECON1,WREN??
???????? BCF???? PIR2,EEIF
?????
???????? RETURN

;---------INITIAL----------------
INIT?????
???????? BCF????? PIR2,EEIF
???????? BCF????? PIE2,EEIE
???????? RETURN
;--------------------------------
??????????? END??