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标题: 读写PIC18F452单片机內部EEPROM的实例 [打印本页]

作者: winnie 时间: 2009-5-6 10:11
标题: 读写PIC18F452单片机內部EEPROM的实例
list p=18f452
   #include <P18F452.INC>
;
;---- 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

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