MCS-51单片机应用子程序：5.3.2二进制浮点数右规

FLTRRN: MOV A,R3 ORL A,R4 JNZ RLN1 MOV R2,#0C1H RET RLN1: MOV A,R3 JB ACC.7,RLN2 CLR C LCALL RL1 SJMP RLN RLN2: CLR OV RET MOV A,R3 RRC A MOV R3,A MOV A,R4 RRC A MOV R4,A INC R2 CLR OV CJNE R2,#40H,RR1E MOV R2,#3FH SETB OV RR1E: RET