CC2530如何设置外部计数功能？

 想了解一些CC2530如何实现通过timer1的各通道外部计数功能，当计数达到一定数值后产生溢出中断。这样的功能能够实现吗？怎样实现？等待高手指教。。。

哎！原来2530没有该功能!!
The timers of CC2530 do not have external pulse count functionality, unfortunately. If the time between your pulses is large enough, you can use an ISR on a GPIO interrupt to update a counter.