Atmega32 Reset pin 9 always LOW

Your source for all things Atmel.
Locked
ratio
Posts: 9
Joined: Sun Aug 21, 2005 11:27 am

Atmega32 Reset pin 9 always LOW

Post by ratio » Sun Aug 28, 2005 4:30 am

Hi there,

My reset pin in always low and I think thats why I'm unable to get any programs out of the MCU. I built my own board based off of http://www.sparkfun.com/datasheets/AVR/ ... 35-sch.gif

Is there a code that I need to use to send a HIGH to the reset pin? I'm trying to do that simple program that counts from 0xFF to 0x00. I can program the MCU but nothing happens afterwards.

Please help
Thanks

ohms
Posts: 4
Joined: Mon Nov 14, 2005 3:54 pm

Re: Atmega32 Reset pin 9 always LOW

Post by ohms » Tue Dec 20, 2005 8:04 am

ratio wrote:Hi there,
My reset pin in always low and I think thats why I'm unable to get any Thanks
First thing is to program your chip. That is an erase, pgm, verify cycle.

Once that works, then at least try disconnecting the programmer from the board and cycling power. If you have tied your reset line high through a resistor, the cpu should start. The programmer should be driving the reset low during programming though.

I did notice that on my programmer avrisp from kanda http://kanda.com/index.php3?cs=1& if you don't choose the "run" option after programming, the reset line is held low.

I too built a circuit from a atmega32, tied reset high through a resistor, connected ground and power, and added a led and resistor to a port pin. The already programmed 32 executed the program. Then I connected my programmer directly to the 4-5 lines and I could ISP it.

Good luck.

Locked

Return to “Code”