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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.


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:

RL78/G1C-Pin Count/Memory Size


Block Diagram:

RL78/G1C Block Diagram

Below you will find information to support the development of your application.
You can find an explanation of orderable part numbers here.


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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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