微處理器 - Microchip ATtiny13 - Assembly - EEPROM

參考資訊：
https://www.microchip.com/en-us/product/attiny13#Documentation
https://nerdathome.blogspot.com/2008/04/avr-as-usage-tutorial.html

在寫入EEPROM之前EEMPE必須先設定，接著才能開始寫入數據


main.s

    .equ EEARL, 0x1e
    .equ EEDR,  0x1d
    .equ EECR,  0x1c

    .org 0x0000
    rjmp main
   
    .org 0x0020
main:
    ldi r16, 0x55
    ldi r17, 0x00
    rcall eeprom_write
  
    ldi r16, 0xaa
    ldi r17, 0x01
    rcall eeprom_write

loop:
    rjmp loop

eeprom_write:
    sbic EECR, 1
    rjmp eeprom_write
    out EEARL, r17
    out EEDR, r16
    sbi EECR, 2
    sbi EECR, 1
    ret

eeprom_read:
    sbic EECR, 1
    rjmp eeprom_read
    out EEARL, r17
    sbi EECR, 0
    in r16, EEDR
    ret 

編譯和燒錄

$ avr-as -mmcu=attiny13 -o main.o main.s
$ avr-ld -o main.elf main.o
$ avr-objcopy --output-target=ihex main.elf main.ihex
$ sudo avrdude -c usbasp -p t13 -B 1024 -U flash:w:main.ihex:i

接著讀取Flash

$ sudo avrdude -c usbasp -p t13 -B 1024 -U eeprom:r:eeprom.bin:r

完成