How to use the Dragon Rider 500 with your AVR Dragon

Step 4 28-pin uC ISP Programming (ATmega8)

The next project demontration will utilize an ATmega8 which is a 28-pin avr. Here is the the basic jumper set for ISP programming the 28-pin microcontrollers.

Jumper Settings

Set the jumpers on the Dragon Rider so that the shunts connect the following pins. (pin4 is the center pin for J22-J-24)

Pins:
J11 - 23
J12 - 23
J13 - 12
J16 - 23
J22 - 42
J23 - 42
J24 - 42

Technical Information

• Connecting J11 and J12 in this fashion allows you to use those pins as I/O pins. The alternative would be to route these pins to make a connection with the external crystal.
• Connecting J13 in this fashion allows us to use it as the reset pin. The alternative would route this pin to the PORTC header for use as an I/O pin. (this would have many drawbacks, including the inability to program this chip using ISP).
• J16 & J22-J24 are connected in this fashion to route the appropriate pins (Reset, MISO, MOSI, and SCK) to the ISP header of the AVR Dragon.

Comments

[xrotaryguy]

I'm confused. The Dragon Rider user guide states that J11 and J12 should have pins 1 and 2 jumped together yet your instructable states that J11 and J12 should have pins 2 and 3 jumped together. Why is this?

[barney_1]

Read this page again. The first bullet point under "Technical Information" covers this.

[xrotaryguy]

I see now. Thanks