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High-function LCD microcontrollers with USB 2.0/rapid charging support for sensor modules and healthcare devices


RL78/L1C microcontrollers have a built-in segment LCD driver and USB 2.0 function. Three LCD driving voltage generation methods (external resistance division, capacitive split, and internal voltage boost) are supported, corresponding to a variety of segment LCD panels. They realize low current consumption (*1): external resistance division: 1.76 μA (*2), internal voltage boost: 1.23 μA, and capacitive split: 0.74 µA. They support USB high-speed battery charging (Battery Charging Specification 1.2) and come in a lineup of 80/100-pin, maximum 416 segment products. These microcontrollers can be used in sensor modules and healthcare devices as well as home appliances and measurement devices.

(*1) Current (typ.) at 1/3 bias, subclock operation, HALT mode, and RTC operation
(*2) Registance value for external registance division = 1000 kΩ


Key Features:

Pin Count 80-pin 100-pin
With USB Without USB With USB Without USB
Memory Program Flash
64 – 256 KB
SRAM 8 – 16 KB
I/O 59 63 77 81
Interrupt 46 (Internal 37 / 42 (Internal 33 / 47 (Internal 38 / 43 (Internal 34 /
External 9) External 9) External 9) External 9)
DTC 32 sources 30 sources 33 sources 31 sources
USB Function 1 channel -
1 channel -
Support speed Full speed (12 Mbps) / -
Full speed (12 Mbps) / -
Low speed (1.5 Mbps) Low speed (1.5 Mbps)
End Point 5 -
5 -
Buffer Size Max. 64 Bytes -
Max. 64 Bytes -
Transmission mode Control, Bulk, Interrupt -
Control, Bulk, Interrupt -
Etc. Battery Charging Rev. 1.2 support, Pull-up / Pull-down and D+ / D- line resistor built-in -
Battery Charging Rev. 1.2 support, Pull-up / Pull-down and D+ / D- line resistor built-in -
LCD Controller/Driver 40 seg. x 8 com. (44 seg. x 4 com.) 52 seg. x 8 com. (56 seg. x 4 com.)
12-bit ADC / 9 channels / 11 channels / 13 channels /
8-bit DAC 2 channels 2 channels 2 channels
Comparators 1 channel 2 channels


Pin Count / Memory Size Lineup:

RL78/L1C-Pin Count/Memory Size


Block Diagram:

RL78/L1C 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

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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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