https://blog.gongquiz.com/2022/04/29/marmemory-address-register%ec%9d%98-%ec%97%ad%ed%95%a0-%ec%a4%91-%ea%b0%80%ec%9e%a5-%ec%98%b3%ec%9d%80-%ea%b2%83%ec%9d%80-%ec%a0%95%eb%b3%b4%ec%b2%98%eb%a6%ac%ec%82%b0%ec%97%85%ea%b8%b0%ec%82%ac/