Analog Devices Lite ADSP-BF527 EZ-KIT, Руководство пользователя

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ADSP-BF527 EZ-KIT Lite Evaluation System Manual 2-17
ADSP-BF527 EZ-KIT Lite Hardware Reference
The
USB_VRSEL
signal is used to provide 5V to a device connected over the
USB OTG interface when running in host mode. Signal
USB_VRSEL
is con-
nected by setting
SW13
position 2
OFF
and position 6
ON
. Then the
PG13
programmable flag pin of the processor can be used to control the 5V reg-
ulator (
VR3
). Refer to “USB OTG Interface” on page 1-20 for more
information.
The
PG0
PF pin of the processor can be used as GPIO or other functions if
SW13
position 1 is turned
OFF
. Turning
SW13
position 1
OFF
and position 5
ON
allows the
keypad_busy
signal to connect to the processor from the key-
pad and touchscreen controller (
U16
).
SW13
default settings are
ON
,
ON
,
OFF
,
OFF
,
OFF
,
OFF
.
Table 2-12. GPIO Enable Switch (SW13)
SW13 Position
(Default) From To Function
1 (
ON
) Push
button 1 DSP
(
U2
,
PG0
)
ON
(
PB1
),
OFF
(UART1 CTS
U25
, host connector
P13.12
, keypad busy
SW13.8
, expansion interface
J1.84
)
2 (
ON
) Push
button 2 DSP
(
U2
,
PG13
)
ON
(
PB2
),
OFF
(host connector
P13.8
, OTG volt-
age select
SW13.7
, expansion interface
J1.85
)
3 (
OFF
) NC
4 (
OFF
) DSP
(
U2
,
PG12
)
PPI CLK
(
U20
)
OFF
(
LED2
, host connector
P13.10
, expansion
interface
J1.81
, STAMP buffer
U34
),
ON
(PPI
CLK
U20
)
5 (
OFF
)
Keypad BUSY
(
U16
)
DSP
(
U2
,
PG0
)
OFF
(
PB1
, UART1 CTS
U25
, host conn
P13.12
,
expansion interface
J1.84
),
ON
(GPIO
keypad busy
U16
,
SW13.1
)
6 (
OFF
) OTG PWR
(
VR3
,
U28
)
DSP
(
U2
,
PG13
)
OFF
(host connector
P13.8
, expansion interface
J1.85
),
ON
(
PB2 SW13.11
, OTG power
VR3
,
U28
)
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