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Low power consumption, standard LCD microcontrollers suitable for LCD display of home appliances or measurement devices


RL78/L13 microcontrollers have a built-in segment LCD driver. 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: 1.61 μA (*2), and internal voltage boost: 1.42 μA, and capacitive split: 0.77 µA. With a lineup of 64/80-pin products supporting up to 376 segments, these microcontrollers are perfect for devices with built-in LCD panels such as home appliances and healthcare 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 64-pin 80-pin
Memory Program Flash 16 to 128 KB
Data Flash 4 KB
SRAM 1 to 8 KB
Operating Frequency 24 MHz (max.)
Clock circuit        

Crystal / Ceramic


1 to 20 MHz (VDD=2.7 to 5.5 V), 1 to 8 MHz (VDD=1.8 to 2.7 V),

1 to 4 MHz (VDD=1.6 to 1.8 V)

subsystem clock 32.768 kHz (VDD=1.6 to 5.5V)
High Speed OCO 24 MHz +-1 %
Low Speed OCO 15 kHz +-15 %
PLL Built-in
I / O 49 65
Timer TAU(16-bit timer) 8 ch (with 1 ch remote control output function) (timer outputs: 8, PWM output 7 ch)
KB20(16-bit timer) 1 ch (PWM outputs: 2)
12-bit timer Interval timer x 1 ch (15 kHz/32.768 kHz)
High accuracy real-time clock 1 ch
RTC output 1
8/10-bit A/D Convertor 9 ch 12 ch
Comparators 2 ch
Serial interface  CSI / UART / Simplified I2C

CSI: 2 ch , UART: 3 ch, LIN: 1 ch

Simplified I2C: 1 ch (max)

CSI: 2 ch , UART: 4 ch, LIN: 1 ch

Simplified I2C: 2 ch (max)

I2C (Multi-master) 1
Interrupt 11 (external) / 32 (internal) 11 (external) / 35 (internal)
LCD   Internal voltage boosting method, capacitor split method, and
external resistance division method are switchable
Segment signal output 36(32) 51(47)
Common signal output 4(8)
Multiplier and divider / 16*16,32/32,16*16+32
multiply-accumulator circuit
Other peripheral functions LVD, POR, Key return, Clock output/buzzer function
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/L13-Pin Count/Memory Size


Block Diagram:

RL78/L13 Block Diagram

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