这个示例应用程序演示了如何使用一个通用定时器在下降边沿计数模式。定时器4被配置在上升沿被认为是对PM0/CCP0每次递减。计数被初始化为9，匹配设置为0，产生一个中断解雇10积极边缘检测到CCP脚后。-This example application demonstrates the use of a general purpose timer in down edge count mode.　Timer 4 is configured to decrement each time a rising edge is seen on PM0/CCP0.　The count is initialized to 9 and the match is set to 0, causing an interrupt to fire after 10 positive edges　detected on the CCP pin.