eZ8-arduino

Mostly testing for eZ80 to see if I can write a working STK500v1 bootloader onto it.

Requirements

• Arduino IDE
• ZDS II Development IDE
• 1× Z8F082A chip
• 1× Zilog Encore! Smart Cable
• Lots of Dupont jumper wires
• 1× USB breadboard power supply (Amazon link)
• 2× breadboards
• Headers to fit the 2×3 debug header
• 2× 10K resistors
• 1× LED (any color)
• 1× FTDI Adapter (Amazon link)

Breadboard Setup

1. Main Breadboard

Set up your first breadboard to match this schematic:

For more details, see official documentation (UM0294).

2. Chip Breadboard

• Place the Z8F082A chip in the middle of the second breadboard.
• Connect the first setup to the chip as shown in the chip specifications, pg 25:

• Match up the pins:
  • DBG (P15)
  • RESET (P14)
  • (T_MSG isn't required)
• Connect power to the chip:
  • VDD (POS/P4)
  • VSS (NEG/P7)
• Do not connect 5V to the chip. Connect the breadboard power supply (3V) to the power rails.

FTDI UART Connection

LED Connection

• Place an LED on your breadboard.
• Connect the cathode to pin 19 of the chip.
• Connect the anode to ground.

Load the Project

1. Set up the ZDS II IDE on your computer.
2. Open the project from this repository.
3. Open a command line in the directory containing avrdude (typically {Arduino_ROOT}\hardware\tools\avr\bin).
4. Run one of the commands listed in ./references/quickstart-sim.md, depending on the chip signature found in ./src/stk500.h.

Final Notes

• Try uploading a hex file to the chip.
• In ZDS II, you can view the chip's memory by pausing execution and going to "Memory".
• Check if the chip successfully wrote to memory at address 0x1000.

Good luck!