Demonstrations for tima as basetimer operation.

example code ：
	PA0、PA1 toggle in timer interrupt 
	
	TIMA0 config capture PWM: CH0 capture rising and CH1 capture failing.
	PD6 toggle  putin PC4 and print capture result
	
1. timer interrupt example：
	freq：100M。
	
	timer interrupt calculate formula：(period+1)/Freq *(Prescaler+1)
									= (0xfffe+1)/10000000 * (99+1)
									=  65.535ms
	



