定时时间的计算与定时器寄存器初始化相关的数据结构在库文件“stm32f10x_tim.h”中：/* TIM Base Init structure definition */typedef struct{u16（1）/* 定时周期值：Period value */u16 （2） /* 预分频因子：Prescaler value */u16（3）/* 定时器分频因子：Timer clock division */u16 （4）/* 定时器计数模式：Timer Counter mode */} TIM_TimeBaseInitTypeDef;定时器的定时时间主要取决于（5）和（6）。例如，当 TIM_Period 设为 （7），TIM_Prescaler 设为（8），表示累计 36000 个脉冲频率后产生个更新或者中断（也是说定时时间到），而脉冲频率是对 TIMxCLK 频率经过了 2000 分频。因此，定时时间 T 为：（9）即 1s 溢出一次。注意：TIM_Period 和 TIM_Prescaler 这两个变量都是 （10），它们的取值范围是 0～65535。

阅读三。Tim is a student. Tim’s father is a policeman. His mother is a teacher. His uncle works in a hospital. He is adoctor. His aunt also works in a hospital. She is a nurse. 1.Who is a policeman?A. Tim B. Tim’s father C. Tim’s mother A: Tim B: Tim's father C: Tim's mother

This room is . A: of Tim and Li Ming B: Tim and Li Ming's C: Tim's and Li Ming's

Watch the video and choose the best summary for Tim and Robert. Tim

Why was Tim's day probably better than Grace's. A: Tim doesn't mind being really busy. B: Tim is a more positive person than Grace C: Tim enjoyed a thought-provoking lecture. D: Tim really loves studying in China

What did the policeman ask Tim to do A: He asked Tim to give money. B: He asked Tim to sing a song for him over the loudspeaker. C: He asked Tim to play guitar.

Watch the video clip and put the following statements into the correct order. A: Harry, Tim’s best friend, gets an iPad. B: Tim spends half an hour playing games. C: Tim and his friends have a party, celebrating the end of the semester. D: Tim will have fewer courses next semester. E: Tim gets a new laptop. F: Tim talks with his mom. G: Tim is at a restaurant with his mom. H: Tim signs up for five courses this semester.

Where are Tim and Kate A: In Kate’s house. B: In a hospital. C: In Tim’s house.

定时器的定时时间与下列哪个参数有关？（ ） A: TIM_Prescaler B: TIM_Channel C: TIM_CounterMode D: USART_Mode

Tim:Hey,Hilary.Howisyour(1)___________thissemester? Hilary:Letmesee.Ihaveitrighthere.Itlooksprettybusy.IhavemathclassonTuesdayandThursdaymorning.OnMonday,WednesdayandFridayafternoonIhavephysics.Thosearemy(2)___________coursesbecauseI’maphysicsmajor. Tim:Howabout(3)___________classes?Areyoutakinganythingelse? Hilary:Yes,I’mtakingacourseinRomanhistoryasanelective.TheclassiseveryFridaymorning.Howaboutyou,Tim?Howisyourschedulethis(4)___________? Tim:It’scrazy!IhaveEnglishclasseveryday.IamtakingaShakespeareclass,too.Heismy(5)___________writer.It’sgoingtobeabusysemester. Hilary:Youcansaythatagain. Unit1