Introduction - If you have any usage issues, please Google them yourself
External interrupts and timers, is the most basic and most important microcontroller two functions we put them together, so that we are familiar with the microcontroller to control multiple internal devices. Because P3.2 connected to J8 of a side, all the buttons " S19" is an external interrupt. The highest bit digital tube has been show 0- 9. When the " S19" is pressed, it will perform a light water code. Because the external interrupt 0 priority than the priority of the Timer 0 high. In the implementation of light water, the digital display will not change the value, so that continues to display after.