# ATtiny44 not responding to AVRISP mkII programmer

It's not responding to the programmer at all in avr studio.

avrisp     attiny44
mosi  -- - mosi
miso  ---- miso
sck   ---- usck
reset ----  reset


Or can it not be programmed by an mk2? I assumed all chips can be programmed by it

• Did you connect the two grounds together also? – Toby Jaffey Mar 26 '11 at 20:36

The AVRISP mkII can program the tiny44 in the latest version of AVR Studio (4.18 SP3 or 5 beta). Make sure your version is either up-to-date or check the help files/release notes that came with it to verify. Also allow AVR Studio to update the firmware in your AVRISP mkII if it needs to.

Verify the following conditions:

• Programmer is connected to PCB (GND, RESET, MOSI, MISO, and SCK)
• Target is powered.
• Not sure how much power the AVRISP MKII can provide, but don't rely on it if your board takes more than 50 mA.
• You do not need to connect the programmer's VCC line to the chip power if you provide it externally.
• MOSI, MISO, SCK have pullups to GND/VCC no stronger than 820 Ω.
• RESET pullup should be no stronger than 4.7 kΩ and have a decoupling capacitor less than 10 µF.

Follow the troubleshooting guide in the AVRISP mkII user guide [PDF] if you experience problems as a first step:

• I was told the vcc and gnd is used as detecting the logic level am using. It doesn't provide power. is that not true – Ageis Mar 27 '11 at 14:05