Renesas R8C/25 Handbuch

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Rev. 1.1
R8C25 QuickDesign Guide.doc Page 1 of 10 12/23/2007
R8C QuickDesign Guide
Introduction
The purpose of the document is to help the designed get started their design on the
R8C/25 family. This document covers some commonly asked questions and provides
some design tips. The document is not intended to be a replacement for the hardware
manual; it is intended to supplement the manual by highlighting some key items most
engineers will need to start their own design. It also discusses some design decisions
from an application point of view
Contents
1. Power Supplies and Bypassing
2. Memory
a. Memory Access Time
i. Flash
ii. RAM
iii. SFR
3. Reset and Reset Circuit
a. Recommended Reset Circuit
b. State of device during Reset
4. GPIO
a. Protected Ports
b. Pullups
5. Clock circuits
a. On-Chip Oscillator
b. High Speed Crystal
c. Low Speed Crystal
d. Reset State and switching oscillators
6. Interrupts
a. Vector Table
b. Clearing Interrupt Request
c. Key Input Interrupt
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Inhaltsverzeichnis

Seite 1 - R8C QuickDesign Guide

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 1 of 10 12/23/2007 R8C QuickDesign Guide Introduction The purpose of the document is to help the

Seite 2 - 2. Memory

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 10 of 10 12/23/2007 #pragma INTERRUPT {function declaration} /E The compiler will automatically re-en

Seite 3

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 2 of 10 12/23/2007 1. Power Supplies and Bypassing 1.1. Operating Frequency The maximum operating fre

Seite 4 - 4. Voltage Detect

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 3 of 10 12/23/2007 When using the POR feature do not connect a capacitor from the Reset input to Groun

Seite 5

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 4 of 10 12/23/2007 control the Reset line. The Debugging section of this document provides additional

Seite 6 - 7. Protection Register

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 5 of 10 12/23/2007 • Port 0 direction register is protected from accidental modification. Before mod

Seite 7 - 8. Interrupts

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 6 of 10 12/23/2007 6. Clock Circuits 6.1. Reset Conditions • On Power-Up and after a Reset the MCU

Seite 8

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 7 of 10 12/23/2007 8. Interrupts The R8C has individual interrupts for nearly all peripherals. The i

Seite 9

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 8 of 10 12/23/2007 normally used, if an ID code is not intentionally written to these locations the ID

Seite 10

Rev. 1.1 R8C25 QuickDesign Guide.doc Page 9 of 10 12/23/2007 6. The CPU gets interrupt information (interrupt number and interrupt request leve

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