DEL: MOV R5,#100 ;1t
DEL0:MOV R6,#200 ;1t
DEL1:MOV R7,#248 ;1t
DEL2:DJNZ R7,DEL2 ;2t
DJNZ R6,DEL1 ;2t
DJNZ R5,DEL0 ;2t
RET ;2t
time=1t+{1t+[(1t+2t*248+2t)*200]+2t}*100+2t
=3t+{3t+[499t*200]}*100
=3t+100*{3t+99800t}
=3t+9980300t
=9980303t
=9980303*2us
=19960606us
=19.960606s
发表时间:2003年7月1日19:50:01