0003H外部中断0000BH定时/计数器0中断0013H外部中断1001BH定时/计数器1中断0023H串口中断2.题目：A=11H,R0=33H,B=44H,(11H)=22H,(22H)=66H,(33H)=44HA=33HB=55H(40H)=44H(11H)=66H(33H)=66H（题目没看错的话）
