M37480M8-XXXFP 데이터 시트보기 (PDF) - Renesas Electronics

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M37480M8-XXXFP

8-BIT SINGLE-CHIP MICROCOMPUTER

Renesas Electronics 

Table of contents

CHAPTER 2 APPLICATIONS

2.1 Input/Output Pins .................................................................................................................. 2-2

2.2 Timer X and Timer Y ............................................................................................................ 2-4

2.2.1 Application Example of Timer Mode ........................................................................... 2-4

2.2.2 Application Example of Event Count Mode................................................................ 2-6

2.2.3 Application Example of Pulse Output Mode ............................................................... 2-8

2.2.4 Application Example of Pulse Period Measurement Mode .................................... 2-10

2.2.5 Application Example of Pulse Width Measurement Mode ...................................... 2-12

2.2.6 Application Example of Programmable Waveform Generation Mode ................... 2-14

2.2.7 Application Example of Programmable One-Shot Output Mode............................ 2-16

2.2.8 Application Example of PWM Mode .......................................................................... 2-18

2.3 Serial I/O ............................................................................................................................... 2-20

2.3.1 Application Example of Clock Synchronous Serial I/O Transmission ................... 2-20

2.3.2 Application Example of Clock Asynchronous Serial I/O (UART) Reception ....... 2-22

2.3.3 Application Example of Bus Arbitration Interrupt ..................................................... 2-24

2.4 A-D Converter ...................................................................................................................... 2-29

2.4.1 Determination of A-D Conversion Values ................................................................. 2-29

2.4.2 Application of A-D Converter ..................................................................................... 2-30

2.5 Reset ...................................................................................................................................... 2-32

2.6 Oscillation Circuit ............................................................................................................... 2-33

2.6.1 Oscillation Circuit with Ceramic Resonator .............................................................. 2-33

2.6.2 External Clock Input to XIN ........................................................................................ 2-33

2.7 Power-Saving Function ...................................................................................................... 2-34

2.7.1 Application Example of Stop Mode ........................................................................... 2-34

2.7.2 Application Example of Wait Mode ........................................................................... 2-36

2.8 Countermeasures against Noise ...................................................................................... 2-38

2.8.1 Shortest Wiring Length ............................................................................................... 2-38

2.8.2 Connection of Bypass Capacitor across VSS Line and VCC Line ......................... 2-40

2.8.3 Connection of Bypass Capacitor across VSS Line and VREF Line ....................... 2-40

2.8.4 Wiring to Analog Input Pins ....................................................................................... 2-40

2.8.5 Consideration for Oscillator ........................................................................................ 2-41

2.8.6 Setup for I/O Ports ...................................................................................................... 2-42

2.8.7 Providing of Watchdog Timer Function by Software ............................................... 2-43

2.9 Notes on Programming ...................................................................................................... 2-44

2.9.1 Notes on Processor Status Register ......................................................................... 2-44

2.9.2 Notes Concerning Decimal Operation ....................................................................... 2-45

2.9.3 Notes on JMP Instruction ........................................................................................... 2-45

2.10 Differences between 7480 and 7481 Group, and 7477 and 7478 Group .............. 2-46

2.10.1 Functions Added to 7480 Group and 7481 Group ............................................... 2-46

2.10.2 Functions Revised from 7477 Group and 7478 Group ........................................ 2-47

2.11 Application Circuit Examples ......................................................................................... 2-48

iv

7480 Group and 7481 Group User’s Manual

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