Programming 28 pin ATMEL AVR with crystal option

[Alberto Maccioni]

Hello, I discovered a bug in the ATMEL AVR adapter board that prevents programming 28 pin devices configured with crystal or external clock.
The problem is that pin 10 (X2) is connected to GND in order to support 20 pin devices like the ATTiny2313; but it has to be floating when using 28 pin devices like the ATMega8 when they require an external clock.
The short term solution is to either:
a) bend pin 10 of 28 pin devices in order to leave it out of the socket.
b) cut the GND trace that goes to pin 10 (leave traces to the other GNDs untouched); connect it again if using a 20 pin device that goes in that socket (best thing would be to include a jumper).

I will redesign the adapter with a jumper to close pin 10 to GND or with a separate 20 pin socket.

[ded6moroz]

Jumper is going to be a better solution, but the adapter board would be a little longer. Is there really going to be a HVSP support for AVR?

[Alberto Maccioni]

I agree, and I think it could fit in the present board size.
HVSP has been added in the latest 0.9.0 version; you can use it only on chips that support it, like some ATTiny.

[im99]

As a variant.. and in the present board..