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Table of Contents 2
2.6.3 Serial interface UART transmission interrupt ................................................................48
2.6.4 A/D conversion interrupt ................................................................................................50
2.6.5 Enable multiple interrupts ..............................................................................................52
2.7 Main routine .........................................................................................................................54
2.7.1 A/D conversion processing .............................................................................................55
2.7.2 Serial reception data processing .....................................................................................57
2.7.3 Key input processing ......................................................................................................60
2.7.4 PWM output setting ........................................................................................................62
2.7.5 Switching PWM output phase ........................................................................................68
2.8 Watchdog timer settings .......................................................................................................71
2.8.1 Reset watchdog timer .....................................................................................................71
2.8.2 Watchdog timer overflow processing .............................................................................74
2.9 Creating executable EX files ................................................................................................75
2.9.1 Introduction of BAT files ...............................................................................................75
2.10 System for developing this program ....................................................................................76
2.10.1 Development system configuration ................................................................................76
Chapter 3 Microcomputer Basics 1
3.1 Chapter overview ...................................................................................................................2
3.2 External interrupt ...................................................................................................................3
3.2.1 Setting specification polarity edge interrupts ...................................................................3
3.2.2 Setting both edges interrupts ............................................................................................8
3.2.3 Specification polarity edge interrupt using noise filter ..................................................13
3.2.4 Both edges interrupts using noise filter ..........................................................................20
3.3 I/O ports ...............................................................................................................................27
3.3.1 Setting output port ..........................................................................................................27
3.3.2 Setting input port ............................................................................................................30
3.4 Input-only port .....................................................................................................................33
3.4.1 Setting input-only port ....................................................................................................33
3.5 Pull-up resistor .....................................................................................................................35
3.5.1 Setting pull-up resistor ...................................................................................................35
3.6 8-bit timer operation .............................................................................................................37