R0=23H,R1=28H,(20H)=20H,(21H)=00H,(22H)=17H,(23H)=01H,,(24H)=00H,(25H)=A0H,(26H)=6FH,(27H)=76H ,(28H)=00H 其实这个问题主要检查的是DJNZ语句对程序状态寄存器的影响!虽然其为自减语句,但对借位标志(C)无影响。