Re: [avr-chat] how to connect USBasp to attiny2313

[Andreas Graebe]

Am Freitag, den 02.08.2013, 07:22 +0200 schrieb YuGiOhJCJ Mailing-List:
> Hello,
> 
> I have just bought a USBasp programmer [1] to program an ATMEL attiny2313 
> micro-controller [2].
> I would like to use avrdude to program my micro-controller.
> 
> On [1] I can see the schematic of USBasp whereas in [2] I can see the 
> schematic of attiny2313.
> But it is not enough because I can't guess how to link the 10 pins of USBasp 
> with the 20 pins of attiny2313.
> I can see the VCC and the GND in each of them, so I can imagine that I must 
> link like this:
> 
> USBasp -> attiny2313
> ---
> VCC (2) -> VCC (20)
> GND (10) -> GND (10)
> ---
> 
> But I am not sure.
> How to know what to do with the 8 other pins of USBasp ?
> 
> Thank you.
> Best regards.

Hi, that's very simple. As you see in the datasheet, /Reset is on pin 1,
SCL on 19, MISO on 18, MOSI on 17.

It is very important that the controller ha a clock signal. By default,
it is the internal oscillator, with a prescaler by 8. So you have to set
your programmer to "slow clock" propably.
If you want to change the clock source, you have to change the
fuse-bits. This could be a trap; if you set them in a wrong way, the
controller needs propably an external clock.

A very good site for the programming of fuse-bytes is
http://www.engbedded.com/fusecalc they generate the code to change the
fusebits for avrdude.

I wish you good luck. Have fun.

-- 
Mit freundlichen Grüßen / kind regards
Andreas Graebe