Analog Devices Lite ADSP-BF527 EZ-KIT, Manual

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Push Button and Switch Settings
2-16 ADSP-BF527 EZ-KIT Lite Evaluation System Manual
Rotary NAND Enable Switch (SW11)
The rotary NAND enable switch (
SW11
) disconnects the rotary encoder
signals from the GPIO pins of the processor. When
SW11
is
OFF
, its associ-
ated GPIO signals can be used on the host interface (see Table 2-11 ).
Position 4 of
SW11
disconnects the chip enable for NAND flash memory
(
U4
).
GPIO Enable Switch (SW13)
The general-purpose input/output (GPIO) switch (
SW13
) disconnects the
associated push buttons and LED circuits from the GPIO pins of the pro-
cessor and allows the signals to be used for other functions. Depending on
the switch configuration, the signals can be used as PPI clock select,
keypad_busy
, or OTG host mode 5V select (see Table 2-12 ).
To select an on-board or external PPI clock through software, set
SW13
position 4
ON
. Drive the
PG12
programmable flag to low (
0
) to connect an
external expansion interface clock. Drive
PG12
high to select the on-board
PPI oscillator. By default,
SW13
position 4 is
OFF
and the PPI clock source
is on-board.
Table 2-11. Rotary NAND Enable Switch (SW11)
SW11 Position
(Default) From To Alternate Function/OFF Mode
1 (
ON
) Encoder
(
SW3
)
DSP
(
U2
,
PF13
)
Expansion interface (
J2.34
,
J2.52
) STAMP
buffer (
U34
)
2 (
ON
) Encoder
(
SW3
)
DSP
(
U2
,
PF12
)
CS audio codec (
U2
), CS keypad/touch controller
(
U16
), expansion interface (
J2.30
,
J2.51
),
STAMP buffer (
U30
)
3 (
ON
) Encoder
(
SW3
)
DSP
(
U2
,
PF11
)
Expansion interface (
J2.32
,
J2.50
), STAMP
buffer (
U34
)
4 (
ON
) DSP
(
U2
,
PH10
)
NAND
(
U4
)
Host connector (
P13.11
), expansion interface
(
J3.35
)
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