8-bit USB JS MCUs

Block Diagram

Freescale S08JS Microcontroller Block Diagram

Freescale S08JS Microcontroller Block Diagram


8-Bit HCS08 Central Processing Unit (CPU)

  • Up to 24 MHz internal bus (48 MHz HCS08 core) frequency offering 2.7 to 5.5V across temperature range of -40°C to +85°C

On-Chip Memory

  • Up to 16K flash read/program/erase over entire operating voltage and temperature ranges
  • Up to 512 bytes random access memory (RAM)
  • 256 byte USB RAM

Power-Saving Modes

  • Wait plus two stop modes

Clock Source Options

  • Clock source options include crystal, resonator and external clock
  • Multi-purpose clock generator (MCG)—PLL and FLL
  • Internal reference clock with trim adjustment
  • Option to drive USB module with 32.768 kHz crystal


  • USB device module
  • Serial Communications Interface (SCI) module with optional 13 bit break.
  • Serial Peripheral Interface (SPI) - A single 8-bit or 16- bit module with receive data buffer (RDB) hardware match function
  • TPM — Up to 2-channel 16-bit timer/pulse-width modulator (TPM) module
  • RTC—(Real-time counter) 8-bit modulus counter with binary or decimal based prescaler


  • 8 interrupt pins with selectable polarity
  • 12 general purpose input/output (GPIO) pins and 2 output only pins

System Protection

  • A watchdog Computer Operating Properly (COP) reset
    • option to run from dedicated 1-kHz internal clock source or bus clock
  • Low-voltage detection with reset or interrupt
  • Illegal opcode detection with reset
  • Illegal address detection with reset
  • Flash block protection

Development Support

  • ROM based USB boot loader
  • Single-wire background debug interface
  • On-chip in-circuit emulator (ICE) debug with real time bus capture

Part numbers include: MC9S08JS16CWJ, MC9S08JS16LCWJ, MC9S08JS8CWJ, MC9S08JS8LCWJ.


Quick reference to our documentation types.

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Quick reference to our board types.

4 hardware offerings


Quick reference to our software types.

1-5 of 10 software files

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

Engineering Services

4 engineering services

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