Atmel AT43DK355, Руководство пользователя, Страница: 16 / 31

Hardware Description
3-4 AT43DK355 USB Controller Dev. Kit User Guide
3429C–USB–7/04
3.20 Header GND TP1
and TP2
This pin provides ground voltage reference.
3.21 Header JH1
V
ICP
input capture pin for the Timer/Counter1 feature.
3.22 USB External
Downstream Port
J2 and J3
Connectors
These connectors provide downstream connection to USB devices. There are 3 down-
stream ports. Port 1 is permanently used by embedded functions and is not visible. On
this board, be aware that J3 corresponds to USB Port 2 of 43USB355E and J2 corre-
sponds to USB Port 3 of 43USB355E. The power source of these ports is controlled by
power switch U3.
3.23 USB Upstream
Port J1
Connector
This connector provides upstream connection to a host or to another hub.
3.24 Programmable
Microcontroller
U1
This board comes with the AT43USB355E microcontroller.