microjs - Freescale S08JS microUSB minimal system

Project Status: 
released

microjs on a breadboard The freescale S08JS series is one of the lowest cost microcontrollers with a hardware USB implementation. The availability of free C development tools (SDCC and Codewarrior) make the S08JS a great candidate to develop all sorts of inexpensive USB gadgets. microJS is a fully functional S08JS minimal system on a PCB less than a square inch. The board headers can be plugged into a breadboard for prototyping or soldered to another PCB for a permanent placement.

Freescale DEMOJS demo board is a great tool for evaluating the features of the S08JS MCU. However its price (~80USD) is too high for the average starving hacker like the members of our staff. Inspired by ultra low cost development systems from other vendors we developed microjs.

microjs top microjs bottom

ujs

Features

  • support S08JS8 and S08JS16 in SO-20W package
  • micro USB connector
  • crystal oscillator for full speed USB operation
  • BDM connector (for programming/debugging)
  • 2 LEDs (1 power, 1 controlled by PTB3)
  • All port pins (except PTB2/BKGD) are routed to the side headers
  • option to connect PTB2/BKGD to the side headers
  • option to connect PTA6/RxD, PTA7/TxD and PTB1_RST to the BDM header
Design Files
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