DOC1925 datasheet(54/61 Pages) ETC1

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Troubleshooting Guide

7-2

AVR STK500 User Guide

1925C–AVR–3/03

The AVR device cannot be

programmed (continued).

Reset disable fuse is set.

Check reset disable fuse.

Programming too fast

Check oscillator settings and

make sure it is not set higher

than actual clock.

External pull-up resistor on

reset line too low.

Ensure that external pull-up

resistor is

≥ 4.7 kΩ.

AVR Studio does not detect

STK500.

Serial cable is not connected,

or power is off.

Connect serial cable to

RS232 PROG and check

power connections.

PC COM port is in use.

Disable other programs that

are using PC COM port.

Change PC COM port.

AVR Studio does not detect

COM port.

Disable COM port auto-

detection in AVR Studio file

menu. Force COM port to

correct COM port.

STK500 cannot be switched

off.

Positive center power

connector is used.

Use negative center power

connector.

Turn off STK500 by removing

power connector.

The status LED is blinking

slowly

There is a short circuit on

AREF

Resolve the short circuit.

The status LED is blinking

quickly.

There is a short circuit on

VTARGET.

Resolve the short circuit.

An external VTARGET is

being used and has been

turned off.

Set VTARGET to a value

below 0.3V in AVR Studio.

The LEDs don’t work

(running from external

VTARGET).

STK500 must be powered for

LEDs to work.

Supply poser to STK500 and

turn it on.

Table 7-1. Troubleshooting Guide (Continued)

Problem

Reason

Solution

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