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




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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 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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