7、:MOVR4,#0
DJNZR4,$
DJNZR4,$
RET
;-----------------------------------------------------------
X0_INT:;启动/停止
CPLF0
RETI
;-----------------------------------------------------------
X1_INT:;清零
MOVR1,#0
MOVP0,#3FH
MOVP2,#3FH
RETI
;---------------------------------------------------