Hardware Description
2-6
AT89C5131A Starter Kit Hardware User Guide
4245A–USB–11/04
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 V
BUS
– 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.
