说明：  复位脚MR=P4^6 P0^4~P0^7分别控制A2,A1,A0,/CS2脚,晶振为11.0592M，波特率设为115200bps，无奇偶校验，8位数据位，1位停止位
(Reset mp4 ^ 6 feet MR =, P0 P0 ^ ^ ~ 7 respectively, A0, A1 control A2, feet, CS2/for 11.0592 M, crystals set baud rate, and 115200bps parity, 8 bits of data bits, and stop bits)