Analog Devices Lite ADSP-BF527 EZ-KIT, Manual

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ADSP-BF527 EZ-KIT Lite Evaluation System Manual 1-21
Using ADSP-BF527 EZ-KIT Lite
The control mechanism to turn the two devices on and off are via the
PG13
flag pin of the processor and must be connected on the board to signal
USB_VRSEL
through switch
SW13
. By default,
USB_VRSEL
is held low or a
logic
0
via a pull-down resistor, and both devices are turned off. To use
host mode and provide 5V to a device,
SW13
position 2 needs to be turned
OFF
and position 6
ON
. This disables push button 2. Note that signal
USB_VRSEL
is shared with
HOSTADDR
. The default for positions 2 and 6 of
SW13
are
ON
and
OFF
, which shuts off the
VR3
regulator and
U28
FET. For
more information, see “GPIO Enable Switch (SW13)” on page 2-16 .
The USB OTG interface has a mini-AB connector (
P1
); cables that plug
into
P1
are shipped with the EZ-KIT Lite.
Use the example programs in the EZ-KIT Lite installation directory to
learn about the ADSP-BF527 processor’s device and host modes. For
more information about the USB interface, refer to the
ADSP-BF52x
Blackfin Processor Hardware Reference .
UART Interface
The ADSP-BF527 processor has two built-in universal asynchronous
receiver transmitters (UARTs).
UART1—0
share the processor pins with
other peripherals on the EZ-KIT Lite.
UART1
has full RS-232 functionality via the Analog Devices 3.3V
ADM3202 (
U25
) line driver and receiver. The UART can be disconnected
from the ADM3202 by turning
OFF
all positions of
SW10
. See “UART
Enable Switch (SW10)” on page 2-15 . When using
UART1
, jumpers
JP5
should not be installed.
JP5
is a UART loopback jumper and should be
installed only when running the POST program. If signals
RTS
and
CTS
are
needed for flow control, the
UART1RTS_PENIRQ#
port pin
PF10
can be con-
figured as a GPIO for
RTS
. The
HWAIT
port pin
PG0
can be used for
CTS
by
setting up the pin accordingly. See “UART1 Loopback Jumper (JP5)” on
page 2-22 and “UART Enable Switch (SW10)” on page 2-15 for more
information.
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