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Using the STK526
2.6
2.6.1
On-board Resources
Joystick
The 4+1 ways joystick is convenient for developing input device (USB) application: it
can easily emulate mouse movements, keyboard inputs, etc.
Closing a switch causes the corresponding signal to be pulled low, while releasing (not
pressed) causes an H.Z state on the signal. The user must enable internal pull-ups on
the input pins, removing the need for an external pull-up resistors on the switch.
Figure 2-15 . Joystick Schematic
PB[7..0]
SW3
1
2
Com1
Com2
Select
Lef t
Up
Right
Down
5
7
3
6
4
PB0
PB4
PB5
PB6
PB7
TPA511G
Figure 2-16 . Joystick Implementation
2.6.2
LEDs
The STK526 includes 4 green LEDs implemented on one line. They are connected to
the low nibble of “Port D” of AT90USB82/162 (PORTD[3..0]).
To turn ON one LED, the corresponding port pin must drive a high level. To turn OFF
one LED, the corresponding port pin must drive a low level. It is the opposite method
used in STK500.
Figure 2-17 . STK526 LEDs
STK526 rev. B Hardware User Guide
2-15
7709B–AVR–07/08
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