The 78K0/Lx3 Group is supported only for the customers who have already adopted any of the products. For new adoption, please consider other products such as RL78/L13, RL78/L12 Group.

Key Features:

  • Operating voltage: VDD = 1.8 to 5.5 V
  • Max. frequency: 10 MHz
  • ROM capacities: 8 to 60 KB flash memory
  • RAM capacities:
    • 512 bytes to 1 KB (78K0/LC3, 78K0/LD3)
    • Internal High-Speed RAM 768 bytes to 1 KB / Internal Expansion RAM 1 KB (78K0/LE3, 78K0/LF3)


  • 48-pin/64-pin plastic LQFP package
  • Minimum instruction execution time can be changed from high speed (0.2 μs: @ 10 MHz operation with highspeed system clock) to ultra low-speed (122 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 single-power-supply flash memory
  • Self-programming (with boot swap function)
  • On-chip debug function
  • On-chip power-on-clear (POC) circuit and low-voltage detector (LVI)
  • On-chip watchdog timer (operable with internal low-speed oscillation clock)
  • LCD controller/driver (external resistance division and internal resistance division are switchable)


Product Name Max. LCD segment count
4 com. 8 com.
78K0/LC3 µPD78F040x, µPD78F041x 22x4= 88 18x8= 144
78K0/LD3 µPD78F042x, µPD78F043x 24x4= 96 20x8= 160
78K0/LE3 µPD78F044x, µPD78F045x 32x4= 128 28x8= 224
µPD78F046x 24x4= 96 20x8= 160
78K0/LF3 µPD78F047x, µPD78F048x 40x4= 160 36x8= 288
µPD78F049x 32x4= 128 28x8= 224


  • On-chip segment key scan function: 8 channels
  • On-chip key interrupt function: 8 channels
  • On-chip buzzer output controller
  • I/O ports: 30/34/46/62
  • Timer: 9 channels
    • 16-bit timer/event counter: 1 channel
    • 8-bit timer/event counter: 3 channels
    • 8-bit timer: 3 channels
    • Real-time counter (RTC): 1 channel
    • Watchdog timer: 1 channel
  • Serial interface: 2 channels
    • UART (LIN (Local Interconnect Network)-bus supported): 1 channel
    • UART: 1 channel
  • 16-bit delta-sigma type A/D converter: 3 channels (μPD78F046x and µPD78F049x only)
  • 10-bit successive approximation type A/D converter: 6 channels (μPD78F041x only), 8 channels (μPD78F045x and
  • 78F046x only)
  • Manchester code generator
  • Remote controller receiver
  • Operating ambient temperature: TA = -40 to +85°C


Pin Count / Memory Size Lineup:

78K0/Lx3-Pin Count/Memory Size

Below you will find information to support the development of your application.
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.
Video Watch videos related to this product.


Software Design Support

Title Description
CS+ An integrated development environment that can be used for coding, assembling/compiling, and simulation. (Also included with Renesas Starter Kits.)
E1 A standard Renesas on-chip debugging emulator that enables users to carry out ample debugging for real development at low cost. (Also included with starter kits.)


Hardware Design Support

Title Description
Characteristics data Information on observed values. Please use this as reference data when developing your set.


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