WHAT'S NEW

8 Sep 2010

Application Notes and Sample Code
R01AN0079EJ0100: R8C/35A Group Clock Operation Using RTC: New

For details, please refer to Latest Updates.
Why choose R8C? title

New! R8C/3x and R8C/Lx are powered up even further with diverse on-chip peripheral functions for reducing external parts


  • Matching unnecessary, no oscillation failure, plus greatly shortened oscillation stability time!

  • Power rise gradient (Min.) not prescribed!
    * R8C/Mx, R8C/3xC, R8C/3xD, R8C/3xT and R8C/L3xC only.

  • Save data during power cut-off!

  • Transfer data between memory and registers without going through CPU!

  • Continue operating CPU during data flash write/erase!

  • Built-in Power-Off Mode great for power-saving applications!

*Please see latest hardware manuals for details on functions and their applicable product groups.

Versatile! Choose the best MCU for you from our application-matched lineup
  • Wide pin selection from 20 to 100 pins
  • Rich package and memory selection
  • Diverse products from high-function to standard

Easy-to-use! The basic concepts serving as the backbone for usability
  • Pin assignments which maintain compatibility, and on-chip peripheral functions
  • Built-in high-performance flash memory
  • Robust support for safe design
  • A variety of development tools is available, from starter kits suitable for training and evaluation to emulators equipped with a wealth of debugging functions

High-speed On-chip Oscillator


Even higher functionality!
  • Matching unnecessary, no oscillation failure
  • Greatly shortened oscillation stability time
  • Industry top-class precision
    Oscillation precision of R8C/2A to 2D
    (40 MHz oscillation frequency)
    -20 to 85℃/2.7 to 5.5V: ±2%
    -40 to 85℃/2.7 to 5.5V: ±2.5%
  • EMI noise reduction
 High-speed on-chip oscillator

Power-on Reset & Low Voltage Detection


Safe design!
Power-on Reset Low Voltage Detection
Power-on Reset Low Voltage Detection
  • After power-on, reset is not deasserted until Vdet0 is detected
  • Power rise gradient (Min.) is not prescribed
    * This specification of the power-on reset function
    is supported by R8C/Mx, R8C/3xC, R8C/3xD,
    R8C/3xT and R8C/L3xC only.
  • Generates interrupts when drops in supply voltage (Vdet1 and Vdet2) are detected
  • Triggers reset when Vdet0 is detected
    ↓
    Can save data to data flash during power cut-off
Even higher functionality!
Voltage detection in R8C/3x and R8C/Lx
R8C/3x and R8C/Lx can set detection voltages Vdet0, Vdet1, and Vdet2 independently.
Low Voltage Detection

Data Transfer Controller (DTC)

  • Transfers data between memory and registers without going through CPU
  • Activated by peripheral interrupts
Even higher functionality!
Data transfer without using DTC Data transfer using DTC
Data transfer without using DTC Data transfer using DTC

Example
Send A/D conversion results to RAM
Send A/D conversion results to RAM

Data Flash with Background Operation (BGO)

  • Continue operating CPU during data flash write/erase
  • Lack of need to hold CPU state greatly shortens instruction execution time and increases interrupt response rate
  • No need to worry about data flash programming time, so feels like programming with external EEPROM
*Data flash is flash memory which can be used to store data.

Even higher functionality!
Data Flash with Background Operation (BGO)

Power-Off Mode

  • Power-off mode*1, a low-power mode that can achieve further power savings compared to the previous WAIT and STOP modes, has been newly added.
    • Added Power-off Mode 1*1 for operating RTC (real-time clock) functions using a low-speed clock to reduce power consumption due to leak current.
    • Added Power-off Mode 0*1, in which the power supply is completely disconnected, and which enables exiting by external interrupt.
  • Power-off Mode 1*1 can be easily entered using register settings.

    *1: This function is included in the R8C/Lx Series.
Even higher functionality!
Structure and benefits of power supply control circuit
Structure and benefits of power supply control circuit. This on-chip circuit achieves significant power savings compared to the previous WAIT and STOP modes.