An 8-bit general-purpose microcontroller equipped with real-time output terminals for motor drive

Even though the RL78/G1M microcontroller has a small pin-count 20-pin package, it is an 8-bit general-purpose microcontroller equipped with real-time output terminals for motor drive. It has 120-degree energization control and can drive a BLDC motor. It is suitable for motor control for small home appliances, toys, office automation (OA) equipment, etc.

Key Features:

Items RL78/G1M
Pin count 20-pin
CPU core RL78 core
Program flash (KB) 4KB - 8KB
SRAM (KB) 0.5KB - 1KB
Main system clock High-speed on-chip oscillator clock ∙ 1.25MHz - 20MHz (VDD = 2.7V - 5.5V)
∙ 1.25MHz - 5MHz (VDD = 2.0V Note) - 5.5V)
Low-speed on-chip oscillator clock 15kHz ±15%
I/O ports Total 18
CMOS inputs 2
Timers 16-bit (TAU) 4
Watchdog timer (WDT) 1
12-bit interval 1
Serial interfaces CSI 1
Real-time output (ch) 8
8/10-bit A/D converter (ch) 8
Clock/buzzer output 1
Power-on-reset Yes
External interrupt terminals 7
On-chip debugger interface Yes
Power supply voltage VDD = 2.0V Note) ~5.5V
Operating temperature TA = -40 °C ~ +85 °C (A: Consumer applications, D: Industrial applications)

Note) Use with a voltage range of 2.25V to 5.5V because it includes detection voltage (VSPOR) for the selectable power-on-reset (SPOR) circuit.

Pin Count/Memory Size Lineup:

Program Flash



Block Diagram:

* Use this product within the voltage range from 2.25 to 5.5 V because the detection voltage (VSPOR) of the selectable power-on-reset (SPOR) circuit should also be considered.

You can find an explanation of orderable part numbers here.


Resources for Software and Hardware

Title Description
My Renesas Create a My Renesas account to use our tool download services, receive e-newsletter/update notifications, and take advantage of our other services.
e-learning Information for studying and learning about microcontrollers and microprocessors.
FAQ Frequently asked questions and useful hints for development.
Forum A forum and community site to share technical information, questions and opinions with others who use Renesas products.


Software Design Support

Title Description
e² studio This integrated development environment (IDE) is based on the popular combination of the open-source Eclipse IDE and its CDT plug-in that enables C/C++ language development.
CS+ This integrated development environment (IDE) can be used for coding, assembly, compiling, and simulation. CS+ is also included with starter kits.
E2 emulator Lite This entry-level on-chip debugging emulator provides functionality equivalent to that of the E1 emulator at a low price.
E2 emulator This on-chip debugging emulator has advanced features that improve the efficiency of development. In addition to the basic functions from debugging to flash programming, this emulator supports hot plug-in and external triggers as standard items. This emulator also helps to reduce development time by downloading at high speeds (compared to the E1 emulator) and the ability to work in combination with various solutions such as the tuning of current drawn by systems under development.
E1 emulator This on-chip debugging emulator is a standard model which provides basic debugging functions (production is to be discontinued at the end of December 2019).



Hardware Design Support

Title Overview
Characteristics data Information on observed values. You can use this information for reference during set development as well as system evaluation.
You can filter the sample codes and application notes that are displayed using the below filters.

Action Needed


The information contained herein has been provided by a member of Renesas Partners. This information is provided on the Renesas website provided for convenience and informational purposes only. Renesas is not responsible for the contents of this page or any changes or updates to the information posted on this page. Certain links provided herein permit you to leave this site and enter non-Renesas sites. These linked sites are not under control of Renesas. Renesas is not responsible for the contents of any linked site or any changes or updates to such sites. These links are provided for convenience and informational purposes only. The inclusion of any link does not imply endorsement by Renesas of any linked site.

Renesas's Publication of information regarding third-party products or services does not constitute an endorsement regarding the suitability of such products or services or a warranty, representation or endorsement of such products or services either alone or in combination with any of Renesas's product or service.