PIC12F1822 >> Assembly
Flash Memory
暫存器
注意事項：
1. 操作以row為單位，一個row代表16 bits
2. 寫入資料固定為14 bits，最高的兩個bits無法寫入
3. 最多可以連續寫入16 bytes
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 write: banksel EEADRL movlw 0x00 movwf EEADRL movlw 0x07 movwf EEADRH call flash_erase_word banksel EEADRL movlw 0x00 movwf EEADRL movlw 0x07 movwf EEADRH movlw 0x34 movwf EEDATL movlw 0x12 movwf EEDATH call flash_write_word verify: banksel EEADRL movlw 0x00 movwf EEADRL movlw 0x07 movwf EEADRH call flash_read_word banksel EEADRL movlw 0x34 xorwf EEDATL, w btfss STATUS, Z goto led_off banksel EEADRH movlw 0x12 xorwf EEDATH, w btfss STATUS, Z goto led_off banksel LATA bcf LATA, LED goto $ led_off: banksel LATA bsf LATA, LED goto $ flash_erase_word: banksel EECON1 bcf INTCON, GIE bsf EECON1, EEPGD bcf EECON1, CFGS bsf EECON1, FREE bsf EECON1, WREN movlw 0x55 movwf EECON2 movlw 0xaa movwf EECON2 bsf EECON1, WR nop nop bcf EECON1, WREN bsf INTCON, GIE return flash_write_word: banksel EECON1 bcf INTCON, GIE bsf EECON1, EEPGD bcf EECON1, CFGS bsf EECON1, WREN bcf EECON1, LWLO movlw 0x55 movwf EECON2 movlw 0xaa movwf EECON2 bsf EECON1, WR nop nop bcf EECON1, WREN bsf INTCON, GIE return flash_read_word: banksel EECON1 bcf EECON1, CFGS bsf EECON1, EEPGD bcf INTCON, GIE bsf EECON1, RD nop nop bsf INTCON, GIE return end
編譯
$ gpasm main.s
完成
