© Fujitsu
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4.2.1 自励式与他励式 .............................................................................................63
4.2.2 由单片机发出的脉冲波 ..................................................................................63
4.3 如何使用 PPG 使蜂鸣器发出声音 .........................................................................63
4.3.1 L 幅宽与 H 幅宽的设定 ..................................................................................64
4.3.2 PPG count clock............................................................................................64
4.4 蜂鸣器程序的制作与运行 ......................................................................................65
4.4.1 程序概要........................................................................................................65
4.4.2 程序的制作与运行..........................................................................................67
4.4.3 改变蜂鸣器的音色..........................................................................................68
5 利用中断来控制 LED....................................................................................................69
5.1 “中断”的概念 ....................................................................................................69
5.2 利用“中断”来检测 SW 的状态的方法 ................................................................70
5.3 通过 SW 控制 LED 的程序（中断法） ..................................................................71
5.3.1 程序概要........................................................................................................71
5.3.2 程序的制作与执行..........................................................................................72
6 利用 timer（定时器）来使 LED 闪烁............................................................................75
6.1 什么叫 timer（定时器）........................................................................................75
6.2 通过 Timer 中断控制 LED 闪烁的程序 ..................................................................76
6.2.1 程序概要........................................................................................................76
6.2.2 程序的制作与运行..........................................................................................78
7 如何使用 A/D（模/数）转换器 .....................................................................................81
7.1 模拟信号与数字信号 .............................................................................................81
7.1.1 A/D 转换器的概要 ..........................................................................................82
7.1.2 滑动变阻器 ....................................................................................................83
7.2 制作一个表示电压数值的程序...............................................................................83
7.2.1 程序概要........................................................................................................83
7.2.2 程序的制作与执行..........................................................................................87
8 如何使用温度传感器 ....................................................................................................89
8.1 关于温度传感器 ....................................................................................................89
8.2 温度传感器的使用方法..........................................................................................90
8.3 制作一个表示温度的程序 ......................................................................................91
8.3.1 程序概要........................................................................................................91
8.3.2 程序的制作与执行..........................................................................................94
A 附录 A（程序制作流程） ......................................................................................96
B 附录 B
（寄存器的写入／读出方法） ..................................................................104
C 附录 C（头文件包含路径的设定方法）...............................................................105
