ADSP-BF526 EZ-Board Evaluation System Manual
2-11
ADSP-BF526 EZ-Board Hardware Reference
SPORT0A ENBL Switches/I2C ENBL (SW2 and SW7)
The
SPORT0A
enable switches (
SW2
and
SW7
) connect the
SPORT0A
and TWI
interfaces of the processor to the audio codec, SSM2603 (
U31
). When the
SPORT0A
interface is used on the expansion interface II, turn
SW2
and
SW7
positions 1 and 2 all
OFF
. To disconnect TWI to the audio codec turn
SW2
positions 3 and 4
OFF
. By default,
SW2
and
SW7
are set to all
ON
.
Gauge Signals Switch (SW4)
The gauge signals switch (
SW4
) positions 1 and 2 disconnect the fuel gauge
status LEDs from the BQ27500 fuel gauge device. Positions 3 and 4 dis-
connect the I
2
C signals from the fuel gauge. If the I
2
C bus hangs when
performing fast bus operations, it may be necessary to turn positions 3 and
4
OFF
. By default,
SW4
is set to all
ON
.
Rotary Encoder with Momentary Switch (SW5)
The rotary encoder (
SW5
) can be turned clockwise for an up count or
counter-clockwise for a down count. The encoder also features a momen-
tary switch, activated by pushing the switch towards the processor, which
resets the counter to zero. The rotary encoder is a two-bit quadrature (gray
code) encoder. Refer to the Rotary Counter section of the
ADSP-BF52x
Blackfin Processor Hardware Reference
for more information.
The rotary encoder is disconnected from the processor by setting
SW13
positions 1, 2 and 3 to
OFF
