微處理器 - Microchip PIC12F1822 - Assembly - EEPROM

暫存器


main.s

    list p=12f1822, r=hex
    #include <p12f1822.inc>
    __config _CONFIG1, _FOSC_INTOSC & _WDTE_OFF & _MCLRE_OFF
    __config _CONFIG2, _LVP_OFF

    #define LED 0x00
 
    org 0x0000
    goto start
     
    org 0x0100
start:
    banksel TRISA
    bcf TRISA, LED
   
    banksel LATA
    movlw 0xff
    movwf LATA

test_write:
    banksel EEADRL
    movlw 0x00
    movwf EEADRL
    movlw 0xaa
    movwf EEDATL
    call eeprom_write
 
    banksel EEADRL
    movlw 0x00
    movwf EEADRL
    call eeprom_read
  
    banksel LATA
    xorlw 0xaa
    btfsc STATUS, Z
    bcf LATA, LED
    btfss STATUS, Z
    bsf LATA, LED

idle:
    goto idle

eeprom_write:
    banksel EECON1
    bcf EECON1, CFGS
    bcf EECON1, EEPGD
    bsf EECON1, WREN
    bcf INTCON, GIE
    movlw 0x55
    movwf EECON2
    movlw 0xaa
    movwf EECON2
    bsf EECON1, WR
    bsf INTCON, GIE
    bcf EECON1, WREN
    btfsc EECON1, WR
    goto $-2
    return

eeprom_read:
    banksel EECON1
    bcf EECON1, CFGS
    bcf EECON1, EEPGD
    bsf EECON1, RD
    movf EEDATL, w
    return
    end

編譯

$ gpasm main.s

完成