© 2008, renesas technology america, inc., all rights reserved 1 course introduction purpose this...

1© 2008, Renesas Technology America, Inc., All Rights Reserved

Course Introduction

Purpose This course provides an introduction to the peripheral functions built into R8C/2x

Series microcontrollers (MCUs).

Objectives Learn about Serial I/O functions, programmable I/O ports, A/D and D/A

converters, LIN Bus Understand basic clock configurations and low-power modes Discover facts about flash memory

Content 22 pages (x) questions

Learning Time 25 minutes


Serial I/O Function

Multiple channels: UART0 and UART1 and UART2

Feature fully independent operation

UART0-2: Two modes Clock Asynchronous serial I/O mode (UART mode) Clock Synchronous serial I/O mode

SSU Function also available on some R8C devices. Provides either full I2C or SPI functionality


Serial I/O Function – Synchronous Connection


Serial I/O – UARTx Synchronous Operation


Serial I/O Function – UARTx Asynchronous Data Rates


Serial I/O – UARTx Asynchronous Operation


Serial I/O Function – SSU Unit, Clock Synchronous Serial I/O Function


Serial I/O Function – SSU Unit, I2C Function


Programmable I/O Ports

71 I/O ports: P0, P1, P3, P5, P6, P7, P8 & P9

Input or Output

Each pin also is a peripheral-function

Drive circuits vary Set by Direction register

Programmable internal pull-up resistors

Eliminates external pull-up resistors

Direct LED drive capability 8 P2 lines sink 40mA (max

‘High Drive’)

Schmitt-trigger circuit on inputs Ensures good rise time into

MCU Not included on lines that are

an analog input function


A/D Converter•Successive-approximation type

•12 channels

•8-bit/10-bit selectable

•One-shot mode

•One conversion performed

•Software start

•Interrupt can be generated at conversion end

•Repeat channel mode

•Start/Stop by setting conversion start bit

•No interrupt request generates at conversion complete

•Sweep channel mode

•Multiple channel groups available

•Software start

•Interrupt can be generated at conversion end

•Built-in Sample & Hold


D/A Converter


Hardware LIN


Clock Circuit

BCLK is CPU Clock


Clock Circuit

On-chip oscillators

Sub-clock

Main clock


Clock Circuit


Clock Circuit

WAIT mode

STOP mode


Clock Circuit – State Transitions


Flash Technology

Single-power-supply program and eraseIn-system programmable-even at low voltageBuilt-in flash sequences Reduces program overhead Controlled by software commands

Two programming modes Standard serial I/O CPU rewrite

Byte programmableBlock ErasureSerial ID code protection and parallel programmer block security implemented


Flash Memory Map


CPU Rewrite Mode


Flash Security

Flash memory ID Code protection Unless the ID code sent by the external serial programmer matches the

one the user has programmed into the R8C MCU’s on-chip flash, erase/write operations cannot occur.


Course Completion

Serial I/O function

Programmable I/O ports

A/D converter

Clock circuit

On-chip flash memory

© 2008, renesas technology america, inc., all rights reserved 1 course introduction purpose this...

Documents