˹̽TIM8 ΪPWM Ĳ

ʾܽܣ
	500ms ,(BG)ɲ200ms, 
	Ϊ¼(UPDATE)
	
1. PWMʾ 
	Ƶʣ96M
	PWMƵʣ16K
	
	ʱڼ㹫ʽ(period+1)/Freq *(Prescaler+1)
	                   = (2999+1)/96000000 * (0+1)
					   =  0.00003125s
	Ķ *2  = 0.00003125s * 2  = 0.0000625s
				 Ƶ  = 1/0.0000625 = 16000HZ

2ã
	ɲ״̬ȫΪߵƽ
	ռձȣ 50%
	PWMģʽPWM0
	ԣ   ͵ƽ
	   2us
	0xA0
	ӦüʽDTG[7:5]=10XDT=(64+DTG[5:0])*tdtgtdtg=2*tDTS
					DT = (64+0x20)*2/96000000
					   = 0x000002s
	