R8C/33c DevCon Lab Board

1 x 2 in R8C/33C Lab/Breadboard helper. P0 and P3 drive the breadboard, giving GPIO, ADC, DAC, SPI, I2C, and UART on the breadboard. P1 is used for serial mode 2 programming and UART communications via USB (with HW flow control), as well as driving four discrete LEDs. P2's PWM outputs drive an RGB LED. R8C/33C pin usage.

This is a composite image of the above board and clips from an actual photo of a home-made version of this board (the home made version lacked soldermask and silkscreen, and had some fix-wires on it, as it was an earlier rev).

Design Files

• Schematics
  • rulz-r8c33.sch - gEDA/gschem format
  • rulz-r8c33-schematic.pdf - PDF format
• Layout
  • rulz-r8c33.pcb - gEDA/PCB format
  • rulz-r8c33.pdf - PDF format
• rulz-r8c33.xls BOM spreadsheet

Software

• fakeos.tar.gz - amusing demo app
• fakeos.zip - prebuilt ELF file - 115200,8,N,1
• flash-tool.tar.gz - Linux-based software for downloading apps onto the board

Presentations and Other Info

• R8C/33c Hardware Manual
• A19C: Soup to Nuts with Free Software - 6.4 Mb Presentation
• A31L: Open Hardware with Open Tools - 12.1 Mb Presentation - A31L at home
• "Additional Information" - 560k ZIP of additional information for the A19C presentation and A31L lab - includes links to all needed software, and all of the above design files and software.
• A31L Lab Handout

		Buck-boost switching power supply. The R8C/33C controls all four switching transistors, as well as a load cell. ADCs are used to monitor input/output voltage, inductor current, and load current.			See the serialtap in action!
		Serial tap. The R8C/33C can monitor all eight RS-232 lines as GPIO, as well as receive serial data on both RXD and TXD via its two UARTs. Bi-color LEDS give a visual indication of line states.

Other Designs

Newer, shorter version, four layer board:

12 x 50 mm R8C/1b USB Fob - 12 MHz clock from the USB chip, Port P1 drives four bi-color (red/green) LEDs. The PCB must be thick enough to act as its own USB connector (standard 62 mil FR4 should work).

1 x 2 in R8C/1b Lab/Breadboard Helper - 18.43 MHz clock for perfect UART speeds, cuttable current measuring shunt, port P1 drives eight LEDs. Breadboard connector breaks out power, ground, I2C, and port P1.