Analog Devices ADSP-21369 EZ-KIT Lite, Руководство пользователя

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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 1-15 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