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Product Overview:

RL78/L12 Group microcontrollers have a built-in liquid crystal display (LCD) panel driver that employs the RL78 core which realizes high processing performance while delivering the lowest power consumption in their class.
In addition to a high-precision (±1%) on-chip oscillator enabling 24 MHz CPU operation and other standard on-chip functions from the RL78/G13, the RL78/L12 microcontrollers are also equipped with a built-in ultralow consumption LCD circuit (0.63 uA by internal voltage boost) that reduces operating current when driving an LCD by 30% compared to previous products.
RL78/L12 microcontrollers support up to 280 LCD segments for panels with many pixels, and three methods of generating LCD drive voltage (internal voltage boost/capacitor split/external resistance division).
In addition, abundant functions for supporting functional safety, such as an A/D converter testing function, are also on-chip.
With 32 to 64-pin packages, these products are suitable for home appliances, remote control, kitchen tools, and other consumer electronics and healthcare devices, industrial equipment, and so on.

Pin Count / Memory Size Lineup:


Block Diagram:

Block Diagram image

Key Features:

Power supply voltage: VDD = 1.6 to 5.5 V
Max. frequency: 24 MHz
ROM capacities: 8 to 32 KB
RAM capacities: 1 to 1.5 KB
Data flash: 2 KB


  • 32-pin plastic LQFP
  • 44-pin plastic LQFP
  • 48-pin plastic LQFP (fine pitch)
  • 52-pin plastic LQFP
  • 64-pin plastic WQFN
  • 64-pin plastic LQFP (fine pitch)
  • 64-pin plastic LQFP

Minimum instruction execution time can be changed from high speed (0.04167 µs: @ 24 MHz operation with internal high-speed oscillation clock) to ultra low-speed (30.5 µs: @ 32.768 kHz operation with subsystem clock)
General-purpose register: 8 bits x 32 registers (8 bits x 8 registers x 4 banks)

On-chip internal high-speed oscillation clock:

  • Select from 24 MHz (TYP.), 16 MHz (TYP.), 12 MHz (TYP.), 8 MHz (TYP.), 4 MHz (TYP.), and 1 MHz (TYP.)

On-chip single-power-supply flash memory (with prohibition of block erase/writing function)
On-chip debug function
On-chip power-on-reset (POR) circuit and low-voltage detector (LVD)
On-chip watchdog timer (operable with the on-chip internal low-speed oscillation clock)

On-chip multiplier/divider/multiply-accumulator

  • 16 bits x 16 bits = 32 bits (signed/unsigned)
  • 32 bits / 32 bits = 32 bits (unsigned)
  • 16 bits x 16 bits + 32 bits = 32 bits (signed/unsigned)

On-chip key interrupt function
On-chip clock output/buzzer output controller
On-chip BCD adjustment
I/O ports: 20 to 47 (N-ch open drain: 2)


  • 16-bit timer: 8 channels (remote control output function is available in 44, 48, 52, and 62-pin products only)
  • Watchdog timer: 1 channel
  • Real-time clock: 1 channel (correction clock output)
  • Interval timer: 1 channel

Serial interfaces:

  • CSI
  • UART (LIN-bus supported)
  • I2C

Different potential interface: Can connect to a 1.8/2.5/3 V device when operating at 4.0 V to 5.5 V
8/10-bit resolution A/D converter (VDD = EVDD = 1.6 to 5.5 V): 4 to 10 channels
Standby function: HALT, STOP, SNOOZE modes

LCD Controller/Driver:

  • Up to 35 seg x 8 com or 39 seg x 4 com
  • Supports capacitor split method, internal voltage boost method and resistance division method
  • Supports waveform types A and B
  • Supports LCD contrast adjustment (18 steps)
  • Supports LCD blinking

DMA controller: 2 channels
Power supply voltage: VDD = 1.6 to 5.5 V
Operating ambient temperature: TA = -40 to +85℃

Key Applications:

  • APS camera, digital camera, home audio system, air conditioner, washing machine, induction-heating (IH) cooker, electric rice cooker, power meter, pedometer, scale, etc.

Product Lineup:


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