ATmega8 programmer schematics

Oct 02, 2006 4 Replies
M

Hi all,



I'm trying to build an ATmega8 in-system parallel port programmer. Here's what I've come up with so far (based on the schematic at

formatting link



formatting link



Then I saw this:



formatting link



Now I'm royally confused.



SCK goes to Parallel Port Pin 8 or Pin 6? RST (Reset?) goes to Parallel Port Pin 9 or Pin 6? Must Parallel Port Pins 2 and 12 be tied together? Must Parallel Port Pins 3 and 11 be tied together?



Basically, is my drawing correct? If not, which revisions need to be made?



Thanks in advance



Michael



Vote
Twitter Facebook LinkedIn
M

formatting link

Found one mistake already... looks like Atmel pin 9 (not pin 5) should go to Parallel port Pin 5.

Oops! (ka-boom)

Michael

Vote
Twitter Facebook LinkedIn
P

schreef in bericht news: snipped-for-privacy@i3g2000cwc.googlegroups.com...

formatting link

Michael,

The functions of the ATMEL pins are defined in their datasheets, but the corresponding parallel port pins are defined by the programming software. So different programming software may use different parallel port pins.

petrus bitbyter

Vote
Twitter Facebook LinkedIn
M

formatting link

Thanks! That explains it...

Michael

Vote
Twitter Facebook LinkedIn
D

formatting link

Here is another, but I feel this one was the first:

formatting link
thousands have been built, and it has been designed by the people that write AVR software such as Bascom-avr. It has also been tested and approved by codevision, and many other such programs.

and best of all, if you don't want to make up the circuit yourself, there is a bare printed circuit board at:

formatting link

which is on special at the moment until sold out. Price approx $7USD including air mail postage to anywhere in the world.

extensive hardware and software instructions are on line.

Don...

Don McKenzie E-Mail Contact Page: http://www.dontronics.com/e-mail.html Micro,TTL,USB to 1.5" color LCD http://www.dontronics.com/micro-lcd.html USB,RS232 or TTL to VGA Monitor http://www.dontronics.com/micro-vga.html World\'s smallest USB 2 TTL Conv http://www.dontronics.com/micro-usb.html
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required