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AT89STK-05

AT89C5131A Starter Kit Hardware User Guide

Atmel Corporation 

Hardware Description

2.4 Feature

Description

2.4.1 RS232

The AT89C5131A evaluation board includes all the required hardware to manage the

RS232 communication.

Figure 2-5. RS232 On-board Circuitry

2.4.2 USB Peripheral

The AT89C5131A evaluation board provides all the required hardware to develop a

USB firmware for the AT89C5131A, this includes:

– a USB connector

– 2 test points on D+ and D-

– 1 test point on VBUS

– a USB UNLOAD button which allows to disconnect the pull-up on D+ and then

to simulate an Attach/Detach of the USB cable

The USB peripheral can also be used to perform an In-System Programming.

2-6

4245A–USB–11/04

AT89C5131A Starter Kit Hardware User Guide

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