General problems – Atmel STK500 User Manual

Page 11

General problems

Problem

Cause

Solution

Some of the
port pins are
not working.

The AVR is not
properly mounted in
the ZIF socket.

Make sure the chip is properly
aligned in the socket. When the
spring-loaded latch is depressed,
the chip should fit nicely into the
bottom of the socket.

The code isn't
running.

The AVR has
no/wrong clock
source.

According to the clock fuse setting,
select the appropriate clock source
on STK500 and STK505. Check the
OSCSEL jumper on STK500 and
clock switch on STK505. If you are
using a crystal in one of the
sockets, check that it is firmly
mounted in its socket.

The AVR will
not run on x
MHz, but works
ok on lower
frequencies.

The clock frequency is
exceeding the clock
rate of the AVR (at a
certain operating
voltage).

Check that you are running the AVR
within specifications. Check the speed
grade of the AVR and consult the
datasheet for operating frequencies
and voltages.

The AVR will
not run on x
MHz, but works
ok on lower
frequencies. I
have a x MHz
crystal
mounted on
STK500

Crystals should be
placed in the crystal
socket on STK505.

Place the crystal in the socket on
STK505. Set the clock switch to the
HF position.

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