RL78/G12 microcontrollers balance the industry's lowest level of consumption current (CPU: 63 μA/MHz, standby (STOP): 230 nA) and a high performance of32.4 DMIPS (24 MHz). They have an on-chip oscillator, data flash, A/D converter, and more. Built-in safety features (function that detects illegal operation of hardware) enable support for the household appliance safety standard (IEC/UL 60730). With a 20 to 30-pin compact package lineup, these microcontrollers are perfect for sub-microcontrollers of small appliances and consumer and industrial equipment.


  • CPU: RL78 core, Max. 24MHz
  • Voltage: 1.8V to 5.5V
  • Package: 24-pin HWQFN, 20 to 30-pin LSSOP
  • Memory: SRAM Max. 2KB, Program Flash Max. 16KB
  • Timer: 16-bit Timer (ch) x 8, 8-bit Timer (ch) x 4, Watchdog Timer (ch) x 1, 12-bit Interval Timer x 1 ch
  • PWM: PWM Output x 7
  • Analog function: 10-bit A/D Converter (ch) x 8
  • On-chip Oscillator Freq. (MHz): High-Speed: 1, 4, 8, 12, 16, 24MHz
    Low-speed: 15kHz
  • Others: Power-On Reset, Low Voltage Detection


  • Office
  • Home Appliance
  • Healthcare
  • Security

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
RL78/G12 Datasheet Datasheet PDF 1009 KB
User Guides & Manuals
RL78/G12 User's Manual: Hardware 日本語 Manual PDF 5.33 MB
Data Flash Access Library Type T02 (Tiny) Manual PDF 705 KB
Data Flash Access Library FDL-T01 RL78 Series Manual PDF 498 KB
Flash Self-programming Library Type T01, European Release Manual PDF 806 KB
Data Flash Access LibraryType T04 (Pico), European Release Manual PDF 594 KB
RL78/G11 Promotion Board User's Manual Manual PDF 1.84 MB
RL78/G11 Promotion Board - Quick Start Guide Quick Start Guide PDF 816 KB
RL78 Software Migration Guide CS+ to e2 studio Migration (CC-RL) 日本語 Guide PDF 3.23 MB
RL78 family User's Manual: Software 日本語 Manual PDF 1.45 MB
Technical Updates
Restriction regarding Watchdog timer interrupt 日本語 Technical Update PDF 154 KB
Correction for Incorrect Description Notice RL78/G12 Descriptions in the Hardware User's Manual Rev. 2.10 Changed (TN-RLx-A077B/E) 日本語 Technical Update PDF 125 KB