用51单片机实现外围设备中断

有5台外围设备，分别为EX1~EX5，均需要中断。现要求EX1与EX2的优先级为高，其他的优先级为低，请用51单片机实现，要求画出电路图并编制程序（假设中断信号为低电平），要执行相应的中断服务子程序WORK1~WORK5。

org0000h

ljmpmain

org0003h

ljmpint0_int

org0013h

ljmpint1_int

org0030h

main:movsp,#60h

orltcon,#00000101b

movie,#10000101b

movip,#000000001b

orlp1,#00011111b

sjmp$

int0_int: jbp1.0,work1

jbp1.1,work2

reti

int1_int: jbp1.2,work3

jbp1.3,work4

jbp1.4,work5

reti

work1:......

reti

work2:......

reti

work3:......

reti

work4:......

reti

work5:......

reti

end