Datasheet

ADSP-21489 EZ-Board Evaluation System Manual 1-17
Using ADSP-21489 EZ-Board
UART Interface
The ADSP-21489 processor features a built-in universal asynchronous
receiver and transmitter (UART). The UART interface supports full
RS-232 functionality via the Analog Devices 3.3V ADM3202 line driver
and receiver (U8). The UART signals are available on the EZ-Board via a
DIP switch (SW14). The UART signals routed through the DIP switch can
be disconnected from the respective DPI interface and used on the expan-
sion II interface. The following DPI pins are used for the RS-232
interface.
• DPI pin 9 (DPI_P9) as UART_TX
• DPI pin 10 (DPI_P10) as UART_RX
• DPI pin 11 (DPI_P11) as UART_RTS
• DPI pin 12 (DPI_P12) as UART_CTS
Example programs are included in the EZ-Board installation directory to
demonstrate UART and RS-232 operations.
For more information about the UART interface, refer to the
ADSP-214xx SHARC Processor Hardware Reference.
LEDs and Push Buttons
The EZ-Board has eight general-purpose user LEDs connected directly to
the processor, one LED connected to the temperature sensing monitor
(ADM1032), one EZ-Board power LED, and one board reset LED. The
EZ-board also has five push buttons: four general-purpose push buttons
connected directly to the processor and one push button for a board reset.
Table 1-3 summarizes LED connections to the processor. To use the
LEDs connected to DAI or DPI, configure the respective registers of the