The 78K0/Kx2-L 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/I1D Group.

Main Solutions

Key Features:

  • Operating voltage: VDD = 1.8 to 5.5 V
  • Max. frequency: 10 MHz
  • ROM capacities: 4 KB to 32 KB flash memory
  • RAM capacities: 384 bytes to 1 KB
  • Package: 16-pin plastic SSOP package, 20-pin plastic SSOP package, 30-pin plastic SSOP package, 44-pin and 48-pin plastic LQFP package"
  • 78K0 CPU core
  • Low power consumption (VDD = 3.0 V)
    • Internal high-speed oscillation mode: 260 μA (TYP.) (at fCPU = 1 MHz operation)
    • STOP mode: 0.7 μ A (TYP.) (at fIL = 30 kHz operation)
    • Subsystem clock and HALT mode: 0.9 μA (at fSUB = 32.768 kHz operation)


  • Clock
    • High-speed system clock ... Selected from the following three source
    • Ceramic/crystal oscillator: 1 to 10 MHz
    • External clock: 1 to 10 MHz
    • Internal high-speed oscillator: 4 MHz ± 2 % (-20 to +70°C), or 8 MHz ± 5 %(-40 to +85°C)
    • Low-speed system oscillator 30 kHz ± 10 % ... Watchdog timer, timer clock in intermittent operation
    • Subsystem clock: clock to operate the Real-time counter mainly


  • I/O ports:
    • 24 (CMOS I/O: 21, CMOS input: 3) for 16, 20, 30-pin products
    • 38 (CMOS I/O: 33, CMOS input: 5) for 44-pin products
    • 42 (CMOS I/O: 37, CMOS input: 5) for 48-pin products


  • Timer
    • 16-bit timer/event counter : Timer output, capture input: 1 channel
    • 8-bit timer H : PWM output : 1/2 channel
    • 8-bit timer/event counter 5 : PWM output, external event counter input: 1/2 chennel
    • Watchdog timer : Operable with low-speed internal oscillation clock: 1/2 chennel
    • Real-time counter : Available to count up in year, month, week, day, hour, minute, and second units: 0/1 channel


  • Serial interface
    • UART : Asynchronous 2-wire serial interface: 1 chennel
    • IICA : Clock synchronous 2-wire serial interface, multimaster supported, standby can be released upon address match in slave mode: 1 channel
    • CSI : Clock synchronous 3-wire serial interface: 1/2 channel


  • 10-bit resolution A/D conversion: 4/6/7/11 chennels
  • Operational amplifier (products with operational amplifier only): 1/2 channels
  • Power-on-clear (POC) circuit
  • Low-voltage detector (LVI) (An interrupt/reset (selectable) is generated when the detection voltage is reached))
    • Detection voltage: Selectable from sixteen levels between 1.91 and 4.22 V


  • Single-power-supply flash memory
    • Flash self programming enabled
    • Software protection function: Protected from outside party copying (no Flash reading command)


  • Safety function
    • Watchdog timer operated by clock independent from CPU ... A hang-up can be detected even if the system clock stops
    • Supply voltage drop detectable by LVI ... Appropriate processing can be executed before the supply voltage drops below the operation voltage
    • Equipped with option byte function ... Important system operation settings set in hardware


  • On-chip debug function ... Available to control for the target device, and to reference memory
  • Operating ambient temperature: TA = -40 to +85°C




Pin Count / Memory Size Lineup:

78K0/Kx2-L-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.
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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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