Re to problem with AVR header board

Development Boards MicroMod
1

Tsevan I think I tried with disconnecting the avrpg2 as I had suspected that it might be the culprit in setting reset low. But IIRC, reset was still low. I’ll try again

I have a few qns abt the header board I bought from sparkfun.(Atmega128 Header Board + AVRPG2)

  1. Do u do any preprogramming of any fuses or any other thing before sending it. Or is the chip completely empty when I got it.

  2. Is the chip in atmega103 compatibilty mode when I got it. If yes , please tell me what I have to do to get it to atmega128 mode. pls describe in a newbie manner to me.

3)Is the watch dog timer always on?

2

i have solved the prev problem : this is for the benefit of those might run into it. The default fuse setting can be read using uisp --rd_fuses

Since i was in ATMEGA103 mode i wasnt able to use uart1. also the clock timings were accndg to the default 1 mhz interenal RC and u have to Program(make = ‘0’) the CLKOPT and make CLKSEL3-0 = (1111)Binary

so the commands assuming ure using uisp are:

uisp -dprog=stk200 -dlpt=/dev/parport0 --wr_fuse_e=0xff

Atmel AVR ATmega128 is found.

Fuse Extended Byte set to 0xff

uisp -dprog=stk200 -dlpt=/dev/parport0 --wr_fuse_h=0x89

Atmel AVR ATmega128 is found.

Fuse High Byte set to 0x89

uisp -dprog=stk200 -dlpt=/dev/parport0 --wr_fuse_l=0xef

Atmel AVR ATmega128 is found.

Fuse Low Byte set to 0xef

3

the reason teh MCU wasnt executing was indeed as Tsetvan advised :

The avrpg2 holds the reset low after programming. BUT i must add that there seems to be an inconsitency .sometime the program runs for some time even with the avrpg2 connected. then after some time it resets the pin again. almost like a capacitive discharge.