DOC1925 datasheet(11/61 Pages) ETC1

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AVR STK500 User Guide

3-1

Rev. 1925C–AVR–3/03

Section 3

Hardware Description

Figure 3-1. STK500 Components

3.1

Description of

User LEDs

The STK500 starter kit includes 8 yellow LEDs and 8 push-button switches. The LEDs

and switches are connected to debug headers that are separated from the rest of the

board. They can be connected to the AVR devices with the supplied 10-wire cable to the

pin header of the AVR I/O ports. Figure 3-4 shows how the LEDs and switches can be

connected to the I/O port headers. The cables should be connected directly from the

port header to the LED or switch header. The cable should not be twisted. A red wire on

the cable indicates pin 1. Confirm that this is connected to pin 1 on each of the headers.

Figure 3-2 shows how the LED control is implemented. This solution will give the same

amount of light from the LED for all target voltages from 1.8V to 6.0V.

Power Switch

Power Connector

Power LED

Parallel Programming

Headers

RS-232 Port

for Programming

Master MCU

Status LED

RS-232 Port

for Communication

Options Setting

Jumpers

Sockets for

Target AVR

Headers

for I/O Ports

Switches

Header for

Switches

RS-232 Interface

Header

DataFlash Interface

Header

LEDs

Header for

Expansion Boards

Header for LEDs

10-pin ISP Header

(for External Target Only)

6-pin ISP Header

Target ISP Headers

Program Button

Socket for

Crystal

Target Reset

Push Button

Header for

Expansion Boards

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