Datasheet

ADSP-21369 EZ-KIT Lite Evaluation System Manual 2-17
ADSP-21369 EZ-KIT Lite Hardware Reference
Push Buttons (SW8–11)
Four push buttons (SW8—11) are provided for general-purpose user input.
Two push buttons are connected to the FLAG pins of the processor, while
the other two are connected to the DAI of the processor. The push but-
tons are active high and, when pressed, send a high (1) to the processor.
Refer to “LEDs and Push Buttons” on page 1-12 for more information.
The push button enable switch (SW7) is capable of disconnecting the push
buttons from the corresponding processor pins. Refer to “Push Button
Enable Switch (SW7)” on page 2-13 for more information.
The push buttons and corresponding processor signals are summarized in
Table 2-9.
Board Reset Push Button (SW12)
The RESET push button (SW12) resets all of the ICs on the board. The only
exception is the USB interface chip (
U4). The chip is not reset when the
push button is pressed after the USB cable has been plugged in and com-
munication initialized correctly with the PC. After USB communication
has been initialized, the only way to reset the USB is by powering down
the board.
Table 2-9. Push Button Connections
Push Button Label Push Button Reference Designator Processor Pin
PB1 SW8 FLAG1/~IRQ1
PB2 SW11 FLAG0/~IRQ0
PB3 SW10 DAI19
PB4 SW9 DAI20