8-bit RS08KB Family of Microcontrollers (MCUs)

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Block Diagram

S08KB Microcontroller Block Diagram

S08KB Microcontroller Block Diagram


8-bit RS08 Central Processor Unit (CPU)

  • Up to 10 MHz internal bus (20 MHz RS08 core) frequency with 1.8V to 5.5V operation across a temperature range of -40°C to +85°C

Clock Source Options

  • Oscillator (XOSC) clock source options include oscillator, crystal or ceramic resonator
  • Up to 20 MHz internal clock source (ICS) module

On-Chip Memory

  • Up to 12 KB flash read/program/erase over entire operating voltage and temperature ranges
  • Up to 254 bytes of RAM
  • Security circuitry


  • Single global interrupt vector
  • Analog-to-digital converter (ADC): 12-channel, 10-bit resolution, 2.5 us conversion time, 1.7 mV/°C temperature sensor
  • Analog comparator (ACMP) with option to compare to internal reference
  • Timer/pulse-width modulator module (TPM): 1 x 2-channel
  • MTIM 8: Two 8-bit modulo timers with optional clock sources
  • Real Time Interrupt (RTI) with optional clock sources
  • SCI module with optional 13-bit break, LIN extensions
  • I2C module capable of up to 100 kbps operation with maximum bus loading
  • Up to eight ports keyboard interrupt (KBI) ports


  • Up to 18 general purpose input/output (GPIO) pins, including one input-only pin and one output-only pin

System Protection

  • Watchdog computer operating properly (COP) module can be reset with option to run from dedicated 1 kHz internal clock source or bus clock
  • Low-voltage detection with reset or interrupt, selectable trip points
  • Illegal opcode detection with reset
  • Illegal address detection with reset
  • Flash block protection

Development Support

  • Single-wire background debug interface
  • Breakpoint setting capability
  • On-chip in-circuit emulator (ICE) debug module

Power-Saving Modes

  • Low-power stop modes, reduced-power wait mode, wakeup from power-saving modes
  • Consumer
    • Small Appliances
    • Toys
    • Handheld Instruments
  • Industrial
    • Lighting Control
    • Battery Chargers and Management
    • Simple Logic Replacements
    • Low-End Thermal Controlled BLDC Fans


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Note: For better experience, software downloads are recommended on desktop.

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