ATtiny13 and ATtiny25, 45 and 85 Targets
The AVR Dragon and Dragon Rider support ISP and Serial High Voltage programming and debugWIRE on-chip debugging of ATtiny13, ATtiny25, ATtiny45 and ATtiny85 targets. Insert the target microcontroller into the 8-pin socket U2 with pin 1 at the upper left. These devices share pins for XTAL1, XTAL2 and RESET with general-purpose IO pins. Headers on the Dragon Rider allow you to use these pins for GPIO, but you will have to temporarily re-route the RESET and, for High-Voltage programming, the XTAL1 pins as instructed below during programming and debugging.
Configuring for ISP
)
To use the ISP interface for programming, place shunts on the following jumpers:
- J8 (U2 pin 1), pin 2 to pin 3 ... U2 pin 1 to RESET
- J16 (RESET), pin 2 to pin 3 ... RESET from Dragon ISP
- J22 (MOSI), center pin to pin 3 (down) ... MOSI to PB0
- J23 (SCK), center pin to pin 3 (down) ... SCK to PB2
- J24 (MISO), center pin to pin 3 (down) ... MISO to PB1
Jumpers J9 and J10 can carry shunts to connect pins 2 and 3 of the target to either GPIO pins PB3 and PB4 or the crystal X1. Remove all other shunts. Either direct (5V nominal) or sub-regulated (e.g. 3.3V) power can be used during ISP programming.
Configuring for debugWIRE
To use the debugWIRE interface for on-chip debugging, place shunts on the following jumpers:
- J8 (U2 pin 1), pin 2 to pin 3 ... U2 pin 1 to RESET
- J16 (RESET), pin 2 to pin 3 ... RESET from Dragon ISP
You can also have jumpers on J22, J23 and J24, which would be useful if you need to switch between ISP and debugWIRE. Jumpers J9 and J10 can carry shunts to connect pins 2 and 3 of the target to either GPIO pins PB3 and PB4 or the crystal X1. Remove all other shunts. Either direct (5V nominal) or sub-regulated (e.g. 3.3V) power can be used during debugWIRE debugging.
Configuring for High Voltage
)
To use High Voltage Serial programming, use a 10-way ribbon cable with headers to connect:
- J21 (PROG DATA) to J2 (PORTB)
Turn on SW2 (5V power direct to VTG from Dragon) and place shunts on the following jumpers:
- J9 (U2 pin 2), pin 2 to pin 3 ... U2 pin 2 to XT1
- J8 (U2 pin 1), pin 2 to pin 3 ... U2 pin 1 to RESET
- J15 (XTAL1), pin 1 to pin 2 ... Clock from Dragon
- J16 (RESET), pin 1 to pin 2 ... RST from Dragon HV
Remove all other shunts. Note that direct (5V nominal) power must be used during High Voltage programming. If you have a crystal socket in the X1 location, remove any crystal. However, it may be possible to proceed with high voltage programming with a crystal and load capacitors in place.
Note on Testing/Verification
The above information has not been verified on all combinations of AVR Dragon firmware revisions, AVR Studio software revisions and Atmel Microcontroller product variants and date codes. Testing has been performed using AVD Dragon firmware revision 0x01010103, microcontrollers ATtiny13-20PU and ATtiny85-20PU and AVR Studio versions 4.13 and 4.12 Service Pack 4.