Programming problems

Problem Cause Solution
ISP programming does not work ISP cable is not connected Connect a 6-pin cable between the ISP6PIN connector on STK500 and the ISP connector on STK504. See Programming the AVR for setup.
The reset signal is not connected to the AVR on STK504 Mount a jumper on pin 6 and 8 on PORTG
The AVR is running at too low clock frequency Make sure the clock switch on STK500 is in the right position. In the Board page of the programming dialog in AVR Studio, try reducing the clock frequency to less or equal to the frequency the AVR is running at.
High Voltage programming does not work The 10-pin cables are not connected correctly See Programming the AVR for setup
The BSEL2, OSCSEL, RESET and VTARGET jumpers on STK500 are not set right. The jumper on pin 6 and 8 on the PORTG header is not mounted
The BSEL2, OSCSEL, RESET and VTARGET jumpers on STK500 are not set right. The jumper on pin 6 and 8 on the PORTG header is not mounted Set the switch to the EXT position. See also Programming the AVR