The 78K0/Fx2-L is an 8-bit microcontroller for automotive use with low power consumption.

Main Solutions

Key Features:

  • Operating voltage: VDD = 1.8 to 5.5 V
  • Max. frequency: 20 MHz
  • ROM capacities: 4 KB to 16 KB flash memory
  • RAM capacities: 384 bytes to 768 bytes
  • 16-pin/20-pin/30-pin plastic SSOP package
  • 78K0 CPU core
  • I/O ports
    • 12 (CMOS I/O: 9, CMOS input: 3), 16 (CMOS I/O: 13, CMOS input: 3), 25 (CMOS I/O: 22, CMOS input: 3)


  • High-speed system clock: Selected from the following three sources
    • Ceramic/crystal resonator: 1 to 20 MHz
    • External clock: 1 to 20 MHz
    • Internal high-speed oscillator: 4 MHz ±2% (-20 to +70°C), 4 MHz ±3% (-40 to +85°C), or 8 MHz ±3% (-40 to +85°C)


  • Internal low-speed oscillator 30 kHz (TYP.) :Watchdog timer, timer clock in intermittent operation
  • Timer
    • 16-bit timer X: 1 channel (PWM output, operation in conjunction with an external signal, A/D conversion trigger generation), 16-bit timer X: 2 channels (PWM output, operation in conjunction with an external signal, synchronous output of up to four channels, A/D conversion trigger generation)
    • 16-bit timer/event counter: 1 channel (PPG output, capture input, external event counter input)
    • 8-bit timer H1: 1 channel (PWM output, operable with low-speed internal oscillation clock)
    • 8-bit timer/event counter 51: 1 channel (PWM output, external event counter input)
    • Watchdog timer: 1 channel (Operable with internal low-speed oscillation clock)


  • Serial interface
    • UART6: 1 channel (Asynchronous 2-wire serial interface)
    • IICA: 1 channel (Clock synchronous 2-wire serial interface, multimaster supported, standby can be released upon address match in slave mode)
    • CSI11: 0/1 channel (Clock synchronous 3-wire serial interface, operable as SPI in slave mode)


  • Multiplier (8 bits x 8 bits = 16 bits, 16 bits x 16 bits = 32 bits, 1-clock operation)
  • 10-bit resolution A/D conversion: 5/6/9 ch
  • Comparator: 1/3 ch
  • Power-on-clear (POC) circuit
  • Low-voltage detector (LVI) circuit (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
  • Assembler and C language supported
  • Enhanced development environment (under development)
    • Support for full-function emulator (IECUBE), and simplified emulator (MINICUBE2)


  • Operating ambient temperature:
    • (A) grade products: TA = -40 to +85°C
    • (A2) grade products: TA = -40 to +125°C


Pin Count / Memory Size Lineup:

78K0/Fx2-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.)


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