Datasheet

SD Interface
1-16 ADSP-BF609 EZ-KIT Lite Evaluation System Manual
An example program demonstrating UART0 in POST is included in the
EZ-KIT Lite installation directory. Note that the loopback of
TX and RX
data is done through an external connector.
SD Interface
The ADSP-BF609 processor has a secure digital (SD) interface. The SD
interface consists of a clock pin, command pin, card detect pin, write pro-
tect pin, and an 8-bit data bus. SoftConfig controls the connection of
processor pins PG10 and PG13 to the card detect and write protect features
of the SD interface. Refer to “Software-Controlled Switches (SoftConfig)”
on page 2-3 and “SD Connector (J5)” on page 2-27for more details.
An example program is included in the EZ-KIT Lite installation directory
to demonstrate how to set up and access the SD interface.
Rotary Encoder Interface
The ADSP-BF609 processor has a built-in, up-down counter with support
for a rotary encoder. The three-wire rotary encoder interface connects to
the rotary switch (SW9). The rotary encoder can be turned clockwise for
the up function, counter clockwise for the down function, or can be
pushed towards the center of the board to clear the counter.
The rotary switch is a two-bit quadrature (gray code) counter with detent,
meaning that both the down signal (
CNT0_DG) and up signal (CNT0_UD) tog-
gle when the count register increases on a rotation to the right. Upon
rotating to the left,
CNT0_DG and CNT0_UD toggle, and the overall count
decreases.
If the processor pins are needed on the expansion interface III, disconnect
the rotary encoder switch via SoftConfig. See “Software-Controlled
Switches (SoftConfig)” on page 2-3 for details.