General problems
Problem
Some of the
port pins are
not working.
Cause
The AVR is not
properly mounted in
the ZIF socket.
Solution
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 The AVR has
According to the clock fuse setting,
running.
no/wrong clock
source.
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
The clock frequency is Check that you are running the AVR
not run on x
exceeding the clock
within specifications. Check the speed
MHz, but works rate of the AVR (at a
grade of the AVR and consult the
ok on lower
frequencies.
The AVR will
not run on x
certain operating
voltage).
Crystals should be
placed in the crystal
datasheet for operating frequencies
and voltages.
Place the crystal in the socket on
STK505. Set the clock switch to the
MHz, but works socket on STK505.
HF position.
ok on lower
frequencies. I
have a x MHz
crystal
mounted on
STK500
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