单键触发8位二进制累加计数器

该程序的目的是让大家熟悉输入、输出端口的使用

该程序的功能是把演示板当做一个按键计数器。刚刚接通电源时，8只发光二极管都不亮。

表示计数器初值为0，当按下开关S3（RB0）时，计数器的值加1，发光二极管D3点亮，表示值1，然后松



开

按钮；再次按下开关S3（RB0）时，计数器的值又加1，发光二极管D4点亮，表示值2，依次类推，反复循



环。-Speed 8-bit binary up-counter trigger　the program aims to let everyone know the input and output ports to use　the program' s function is to demo board as a key counter. Just power on, 8 LEDs are not bright.　 That the counter initial value is 0, when the press switch S3 (RB0), the counter value plus 1, D3 LED lights to indicate a value of 1, and then release　button　again press the switch S3 (RB0), the counter value and add 1, light emitting diode D4, indicating a value of 2, and so on, repeated cycles.