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读写PIC18F452炔EEPROM的实例源程序

发布时间:2020-06-30 20:50:16 阅读: 来源:收纳箱厂家

读写PIC18F452炔EEPROM的实例源程序

本文引用地址: p=18f452 #i nclude C>; ;---- 18F452 RAM LOCATIONS ------Data_EE_Addr EQU 0X000Data_EE_Data EQU 0X001EEPROM_Buffer equ 0x02;--------VECTORS------------

org 0x00 bra START

;-------PROGRAM-------------- org 0x20START 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_DataEE_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_AddrEE_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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