61A的IRQ4中断有三个中断源:1KHz、2Kz和4KHz,每一个中断分别控制与IOA0-IOA1、IOA2-IOA3和IOA4-IOA7相连的LED灯。-61A of the IRQ4 interrupt has three interrupt sources: 1KHz, 2Kz and 4KHz, each interruption of the respective control and IOA0-IOA1, IOA2-IOA3 and IOA4-IOA7 connected to LED lights.