用SN8P2501B做的一个小程序，主要是用普通I/O口控制RGB三色等的渐变，程序没有用单片机自带的PWM功能，用的是TC0定时器，希望能对定时器不熟的初学者有点帮助。-A small program to do SN8P2501B general I/O port control RGB three-color gradient, the program does not use microcontroller comes with PWM function, the TC0 timer, timer unfamiliar early scholars a little help.