MCS―51单片机p1端口上，经驱动器接有8只发光二极管，fosc＝6MHZ,试编写程

Question

序，使这8只发光管每隔2秒循环发光？

Answer 1

ORG 0000H
LJMP MAIN
ORG 000BH
LJMP T0ISR
ORG 0030H
MAIN:
MOV TMOD,#01H
MOV TH0,#HIGH(65536-50000)
MOV TL0,#LOW(65536-50000)
SETB TR0
SETB EA
SETB ET0
MOV A,#0FEH
MOV P1,A
MOV R2,#20
SJMP $
T0ISR:
CLR TR0
MOV TH0,#HIGH(65536-50000)
MOV TL0,#LOW(65536-50000)
SETB TR0
DJNZ R2,T0E
RL A
MOV P1,A
MOV R2,#20
T0E:
RETI
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