Mostly testing for eZ80 to see if I can write a working STK500v1 bootloader onto it.
- 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)
Set up your first breadboard to match this schematic:
For more details, see official documentation (UM0294).
- 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.
Tip
After all wiring, connect the FTDI adapter to the chip as follows:
RX → TX, TX → RX, CTS → CTS
Important
Double-check LED polarity. Reversed connections may prevent the LED from lighting up or could damage components.
- Place an LED on your breadboard.
- Connect the cathode to pin 19 of the chip.
- Connect the anode to ground.
Warning
Incorrect wiring or flashing will permanently damage your chip.
Absolutely do NOT overwrite the first two bits of the flash with zeros otherwise it will be permanently disabled.
Proceed with care!
- Set up the ZDS II IDE on your computer.
- Open the project from this repository.
- Open a command line in the directory containing
avrdude(typically{Arduino_ROOT}\hardware\tools\avr\bin). - Run one of the commands listed in
./references/quickstart-sim.md, depending on the chip signature found in./src/stk500.h.
- 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!