Datasheet

Switch Settings

2-12 ADSP-21262 EZ-KIT Lite Evaluation System Manual

Push Button Enable Switch (SW9)

The push button enable switch (SW9) disconnects the push buttons from

the corresponding processor pins. This allows the signals to be used for

another purpose. Table 2-4 shows the signal and SW9 connections. By

default, all of the position of the SW9 switch are ON, allowing the push but-

tons to function as designed.

Position 6 of SW9 connects or disconnects the latch-enable pin of the LED

to the logical OR of the ~WE and ~LED_CS signals. When position is OFF, the

latch-enable pin of the LED latch (U24) is always pulled high, making the

latch transparent. In this position, the value of the LEDs is directly con-

nected to AD7–0. When position 6 is ON, the values of the LEDs are set by

writing to a memory location. The lower 8 bits of the data, written to the

address 0x1400 0000, set the values of the LEDs. By default, position 6 is

ON, allowing the LEDs to be written by writing to a memory address. For

more information refer to “LEDs and Push Buttons” on page 1-11.

Boot Mode and Clock Ratio Select Switch (SW10)

The SW10 switch sets the boot mode and clock multiplier ration. Table 2-5

shows how to set up the boot mode using positions 1 and 2. By default,

the EZ-KIT Lite boots in SPI master mode and parallel port mode, and

the processor boots from flash memory.

Table 2-4. Push Button Enable Switch (SW9) Connections

Switch Position Push Button Reference Designator Processor Pin

SW1 FLAG1

2 SW2 FLAG2

3 SW3 DAI_P19

4 SW4 DAI_P20