对多个中断的相互运用，独立互不冲突 在掉电状态，允许外部中断0,外部中断1,外部中断2唤醒。arm7,lpc2104周立功开发板 -interruption of a number of the mutual use of each other independent of the power-down mode of the conflict, allowing external interrupt 0, an external interrupt, external interrupt