说明：  熟悉pic12f629芯片的使用，写个简短的程序，进行按键扫描和按键处理，其中按键扫描分长按键和短按键操作有效！
(Familiar with the pic12f629 chip to use, write a short program, the key scanning and keys, including keys and key scan points short length of key operations and effective!)