单片机编程题:fosc=6MHZ,在P1.0产生频率250HZ的方波,持续时间0.5S,静态...答:;ORG 0000H LJMP START ORG 000BH LJMP T0_INT START:MOV TMOD, #02H ;T0定时方式2 MOV TH0, #6 ;定时500us@6MHz MOV TL0, #6 MOV IE, #82H SETB TR0 MOV R7, #4 MOV R6, #125 SJMP T0_INT:DJNZ R7, T0_EXIT CPL P1.0 ;2000us...