Low pin count, compact, low power general-purpose microcontrollers recommended for small electronic devices and sub-microcontrollers


RL78/G10 microcontrollers realize the industry's lowest level of consumption current (CPU: 46 μA/MHz, standby (STOP):

560 nA). With an on-chip oscillator, A/D converter, comparator, and more, and a 10/16-pin package lineup, they support more compact system size. These low pin count microcontrollers are perfect for small consumer electronics.


Key Features:

Pin Count 10-pin 16-pin
CPU Core RL78 core
Program Flash 1 to 4 KB
SRAM 128 to 512 bytes(Non parity)
Max. Frequency 20 MHz@2.7 to 5.5 V / 5 MHz@2.0 to 5.5 V
High-speed system clock - X1,X2(Crystal/Ceramic) oscillation, External main system clock input(EXCLK) : 1to 20 MHz@2.7 to 5.5 V / 1to 5 MHz@2.0 to 5.5 V
High-speed internal oscillator 20 MHz +/- 2 %
Low-speed internal oscillator(for WDT) 15 KHz +/- 15 %
I/O port Total 8 14
CMOS I/O 6 (N-ch O.D. output:2) 10 (N-ch O.D. output:4)
CMOS Input 2 4
Timers 16-bit (TAU) 2 channels 4 channels
12-bit interval - 1 channel
Watchdog (WDT) 1 channel(no window function)
Timer output 2 (PWM output:1) 4(PWM output:3)
SerialInterfaces CSI:1 ch/Simple-I2C:1 ch UART:1 ch

1 unit -
CSI:2 ch/Simple-I2C:1 ch/

UART:1 ch
- 1 unit
I2C bus - 1 channel
8/10-bit resolution A/D converter 4 channels 7 channels
Comparator - 1 channel
Clock/Buzzer output 1
Selectable Power On Reset (SPOR) Provided
Vector interrupt Internal 8 14
External 3 5
Key interrupt 6
Power source pins VDD/VSS(no REGC pin)
Safety functions WDT(no window function),TRAP instruction
On-chip debug function Provided
Voltage 2.0* to 5.5 V (Flash memory rewritable voltage 4.5 to 5.5 V)
Operating ambient temperature Ta = -40 to 85 ℃

* 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.

Pin Count / Memory Size Lineup:

Program Flash



Block Diagram:

RL78/G10 Block Diagram

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
CS+ An integrated development environment that can be used for coding, assembling/compiling, and simulation. (Also included with Renesas Starter Kits.)
e2 studio Renesas eclipse embedded studio, known as e² studio, is a complete development and debug environment based on the popular Eclipse CDT project.
E1 A standard Renesas on-chip debugging emulator that enables users to carry out ample debugging for real development at low cost. (Also included with starter kits.)


Hardware Design Support

Title Description
Characteristics data Information on observed values. Please use this as reference data when developing your set.
Oscillation circuit characteristics The resonators for which the operation is verified and their oscillator constants are shown below.

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