Compact microcontrollers supporting USB communications and rapid charging (USB 2.0, BC 1.2 compliant)


In addition to two USB 2.0 (full speed) host channels or one function channel, the RL78/G1C microcontrollers are compliant with Battery Charging Specification 1.2 (BC 1.2) for high-speed battery charging. These microcontrollers are suitable for office equipment that connect via USB such as a printer, mouse, and keyboard, as well as for USB chargers for healthcare devices, mobile batteries, and more.


Main Solutions

Key Features:

Pin Count 48-pin 32-pin
Memory Flash Program 32 KB
Data Flash 2 KB
Operating Frequency 24 MHz (max.)
Crystal / Ceramic
6, 8, 12, 16 MHz, 32.768 kHz (Only 48-pin)
High Speed OCO 48 MHz +-1 % (Target)
Low Speed OCO 15 kHz +-15 % (Target)
PLL Built-in
I/O 38 22
Timer TAU(16-bit timer) 16-bit timer x 4 ch (Timer output : 4 ch) 16-bit timer x 4 ch (Timer output : 2 ch)
12-bit timer Interval timer x 1ch (15 kHz / 32.768 kHz)
10-bit A/D Convertor 9 ch (Scan 4 ch,
Conversion result comparison function)
8 ch (Scan 4 ch,
Conversion result comparison function)
Simplified I2C
CSI: 2 ch , UART: 1ch,
Simplified I2C: 2 ch (max)
CSI: 2 ch , UART: 1 ch,
Simplified I2C: 2 ch (max)
I2C (Multi-master) 1
Interrupt 10 8
USB Function Host x 2 port / Peripheral x 1 port
Support speed Full speed (12 Mbps) / Low speed (1.5 Mbps)
End Point 5
Buffer Size 448 Byte
Transmission mode Control, Bulk, Interrupt
Etc. Battery Charging 1.2 support, Pull-up / Pull-down and D+ / D- line resistor built-in
Multiplier and divider /
multiply-accumulator circuit
16*16,32 / 32,16*16+32
Other peripheral functions LVD, POR, Key return LVD, POR
Safety function WDT, TRAP instruction, Flash memory CRC operation, RAM parity error detection,
Illegal memory access, Frequency detection, RAM guard, SFR guard, A/D test

Pin Count / Memory Size Lineup:

Program Flash

*1 *1 *1 *1

*1 : 4.5KB 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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