delay.asm

超声波的发射和接收

                    NAME       DELAY
?PR?_DELAY?DELAY    SEGMENT    CODE
                    PUBLIC     _DELAY
		    RSEG       ?PR?_DELAY?DELAY
_DELAY:             PUSH       ACC                ;2
                    MOV        A,R7               ;1
		    JZ         DELA1              ;2
		    INC        R6                 ;1
DELA1:              MOV        R5,#50D            ;2
                    DJNZ       R5,$               ;2
		    DJNZ       R7,DELA1           ;2
		    DJNZ       R6,DELA1           ;2
		    POP        ACC                ;2
		    RET                           ;2

		    END