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RL78 Family Features

1、True Low Power 
  • RL78's three low power modes maximize battery life by disabling idle CPU features




  • No need to wake up CPU for receiving data
  • The unique SNOOZE Mode allows some peripheralsie. ADC and UART operation whilst in standby modes
  • Achieve 1/10th of the power consumption; SNOOZE mode uses 0.5mA vs. 5mA in RUN mode (ADC)



Standby Modes


  • HALT mode disables CPU operation saving as much as 80 % of total MCU current, whilst allowing fast CPU enable time
  • STOP mode achieves lowest power consumption by disabling more CPU functions



Power Consumption Values


2、Broad Scalability

RL78 offers an unprecedented line up

  • Over 1000 devices
  • Available in 10 to 128 pin packages and 1 KB to 512 KB Flash

RL78 MCU's offer full pin compatibility

  • I/O and peripheral pins scale up
  • Easily add additional I/O and functionality by migrating to a larger pin count
  • Keep peripheral pin PCB layout in the same order/position as pin count is increased
  • Software code can be reused across the full RL78 family from 20 pins to 128 pins


Peripheral I/O Re-direction (PIOR) capability remaps functions to alternate ports

  • Due to layout or peripheral pin sharing constraint,there may be conflicts for existing peripheral I/O pin assignments
  • Optimise peripheral pin functionality by easing function bottlenecks on a pin


3、High Performance

RL78/G14 offers up to 44 DMIPS performance at 32MHz

  • Unrivalled power consumption / performance ratio (1/3 that of competitors) *RL78/G14
  • Higher DMIPS rating and lower power consumption than a popular 32 bit competitor technology
  • RL78 offers widest operating voltage in its class from 1.6 V to 5.5 V
  • 85 % instructions executed in one clock cycle


4、System Cost Reduction

Built-in a variety of functions to the microcomputer

  • Reset circuit
  • Low power detection circuit
  • Watchdog timer
  • High-precision (1 %) on-chip oscillator
  • Data flash memory
  • Temperature sensor
  • Multi-power-supply interface port


5、High Quality and Safety

Hardware for IEC/UL 60730 compliance

Renesas Tools for the RL78

Renesas Electronics and selected partners offer a comprehensive suite of hardware and software tools for the rapid evaluation and development of embedded systems built with RL78 MCUs.


RL78 Renesas Promotion Board RPBRL78G13 details here


Hardware development tools

A low-cost on-chip debugging emulator and a full-spec emulator are available. You can select the environment that best matches your debugging needs.


  • E1 on-chip debugging emulator

We also plan to roll out support for Renesas microcontrollers and microprocessors other than the RL78 Family. The E1 provides a wide range of support for Renesas microcontrollers at low cost.


E1 product details here


  • IECUBE In-circuit Emulators

Comprehensive break functions, trace functions useful for analyzing illegal operations, time measurement functions for measuring maximum/minimum/average program execution times, coverage functions for measuring program execution coverage rate, and more, are equipped as standards.


IECUBE product details here


Software development tools

Third Party Tools

IAR Embedded Workbench for RL78 (EWRL78)
Full C and C++ support, C-SPY -- debugger, and instruction simulator

μC/OS-II and μC/OS-III
Real-time operating system for RL78

μC/OS-II and μC/OS-III
Real-time operating system for RL78

Segger embOS
Segger logo Real-time operating system for RL78

FreeRTOS logo Real-time operating system for RL78

KNX protocol stack for RL78 from Tapko
Stack KNX for twisted pair media provided by Tapko for RL78 microcontrollers