General-purpose microcontrollers with built-in high-resolution A/D converter, suitable for measurement devices and sensor applications


RL78/G1A microcontrollers balance the industry's lowest level of consumption current (CPU: 66 μA/MHz, standby (STOP): 230 nA) and a high performance of 43.2 DMIPS (32 MHz). A built-in high-resolution 12-bit A/D converter, on-chip oscillator, data flash, and safety features (function that detects illegal operation of hardware) enable support for the household appliance safety standard (IEC/UL 60730). With an lineup of 25 to 64-pin LGA/BGA and other small packages, these microcontrollers are perfect for consumer and industrial sensor applications.


Key Features:

Pin Count
25-pin 32-pin 48-pin 64-pin
Program Flash 16 to 64 KB 16 to 64 KB 16 to 64 KB 32 to 64 KB
Data Flash 4 KB
SRAM 2 to 4 KB
Power supply voltage 1.6 to 3.6 V
Operating ambient temperature Ta = −40 to +85 °C (A Version : For Consumer applications)
Ta = −40 to +105 °C (G version : For Industrial applications)
Maximum operating Frequency 32 MHz
External Oscillator 1 to 20 MHz: VDD = 2.7 to 3.6 V, 1 to 16 MHz: VDD = 2.4 to 3.6 V,
1 to 8 MHz: VDD = 1.8 to 3.6 V, 1 to 4 MHz: VDD = 1.6 to 3.6 V
X1 (crystal/ceramic) oscillation, external main system clock input (EXCLK)
Internal high speedOn-Chip Oscillator High speed main mode : 1 to 32 MHz (VDD = 2.7 to 3.6V), 1 to 16 MHz (VDD = 2.4 to 3.6V)
Low speed main mode : 1 to 8 MHz (VDD = 1.8 to 3.6V)
Low voltage main mode : 1 to 4 MHz (VDD = 1.6 to 3.6V)
Subsystem clock - XT1 (crystal) oscillation, external subsystem clock input (EXCLKS) 32.768 kHz (TYP.)
Low speed On-Chip Oscillator 15 KHz (TYP.)
Timer 16-bit 8 channels
Watchdog Timer 1 channel
Real-time Clock (RTC) 1 channel
12-bit Interval timer 1 channel
Timer output 2 channels
(PWM output : 1)
4 channels
(PWM output : 3)
7 channels
(PWM output : 4)
RTC output - 1 channel
Serial Interface CSI 1 ch/ UART 1ch/ simplified IIC 1 ch 2 units 2 units 1 unit -
CSI 2 ch/ UART 1ch/ simplified IIC 2 ch - - 1 unit 2 units
CSI 2 ch/ UART 1 ch (supporting LIN-Bus)/ simplified IIC 2ch - - 1 unit 1 unit
CSI 1 ch/ UART 1 ch (supporting LIN-Bus)/ simplified IIC 1 ch - 1 unit - -
IIC Bus 1 channel
12-bit A/D Converter 13 channels 18 channels 24 channels 28 channels
I/O Port CMOS I/O 14 (N-ch O.D. 6) 20 (N-ch O.D. 9) 32 (N-ch O.D. 11) 46 (N-ch O.D. 12)
CMOS input 3 5
CMOS output - 1
N-ch open-drain I/O (6 V tolerance) 2 3 4
Clock output/Buzzer output 1 2 2
DMA controller 2 channels
External vectored interrupt 6 10 13
Key interrupt 0 ch (4 ch) *Note 1 ch (6 ch) *Note 6 10
On-chip debug function Provided

*Note : Channel count by using Peripheral I/O Redirection Register (PIOR)

Pin Count / Memory Size Lineup:

Program Flash

*1 *1 *1 *1 *1 *1

*1 : 3KB available when the self-programing function is used.


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
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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