ADSP-BF526 EZ-Board Evaluation System Manual
1-27
Using The ADSP-BF526 EZ-Board
program the flag pins, refer to the
ADSP-BF52x Blackfin Processor Hard-
ware Reference
.
LED1
is shared with the
HOSTWR#
signal, while
LED2
is shared with the
HOSTACK
signal. The
LED0
signal is shared with the
PPID8
signal. When
using the PPI 16-bit data interface,
LED0
mimics
PPID8
.
The
LED1
and
LED2
signals also connect to the expansion interface II (con-
nectors
J1
,
P2
, and
P4
“Expansion Interface II Connector (J1)” on
and
“Expansion Interface II Connectors (P2 and P4)” on
for more information.
The two general-purpose push buttons are labeled
PB1
and
PB2
. The status
of each individual button can be read through programmable flag inputs
PG0
and
PG13
. The flag reads ‘
1
’ when a corresponding switch is being
pressed. When the switch is released, the flag reads ‘
0
’. A connection
between the push buttons and processor inputs is established through
positions 1 and 2 of the DIP switch,
SW20
.
Push buttons 1 and 2 of
SW20
are used as GPIO signals on the expansion
interface II connectors (
J1
,
P2
,
P4
). To use the
PG0
and
PG13
port pins as
GPIO signals on the expansion interface II, turn
SW20
positions 1 and 2
OFF
.
Push button 1 cannot be used when
PG0
is set up to control the charge
rate, when charging the battery over USB. To set this up, turn
SW20.1
OFF
.
See
“CHG GPIO Jumper (JP15)” on page 2-23
for more information.
Push button 2 can be connected to the
USB_VRSEL
signal by setting
switches
SW13.2
OFF
,
SW20.5
OFF
, and
SW20.6
ON
. The
USB_VRSEL
signal
allows the USB OTG interface to power an external USB device with 5V.
Push button 2 also can be connected to the
OTP_FLAG
signal, which is nec-
essary to supply 7V for writing to OTP. To set up the EZ-Board to
control the
OTP_FLAG
signal, set switches
SW13.2
OFF
,
SW20.5
ON
, and
SW20.6
OFF
. Push button 2 is shared with signal
HOSTADDR
. See
“GPIO Enable Switch (SW20)” on page 2-16
for more information.