ATmega8 datasheet(53/61 Pages) ATMEL

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AVR STK500 User Guide

7-1

Rev. 1925C–AVR–3/03

Section 7

Troubleshooting Guide

Table 7-1. Troubleshooting Guide

Problem

Reason

Solution

The red power LED is not on.

The DC power cable is not

connected.

Connect the DC power cable

to the DC jack (page 2-3).

Wrong power supply is used.

Check that the power supply

is of DC type 10 - 15V, min.

500 mA (page 2-3).

The power switch is off.

Turn on the power switch.

The preprogrammed

example code does not

toggle the LEDs.

There is no AVR device in the

socket.

Plug the AVR device into the

right socket (page 2-3).

The LEDs are not connected

to the I/O ports.

Connect the LEDS header to

the PORTD header, and the

SWITCHES header to the

PORTB header (page 3-3).

The Flash memory is erased.

Connect STK500 to a PC

and reprogram the AVR

device (page 2-3).

The AVR device cannot be

programmed.

The PC serial cable is not

connected.

Connect the serial cable to

the PC COM port and the

RS232 PROG port.

The AVR device is inserted in

wrong socket.

Check that the correct socket

is used (page 3-10).

The AVR device is inserted

with wrong orientation.

Check that the notch on the

AVR socket matches the

notch on the AVR device.

The target ISP header is not

connected.

Connect the 6-pin flexible

cable from ISP6PIN header

to the correct SPROG target

ISP header (page 3-10).

The jumpers settings are

wrong.

Set jumper to default setup

(page 3-15).

The memory lock bits are

programmed.

Erase the memory before

programming.

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