Clock Oscillator; Led Indicators; Pushbutton Switches; Test Points - Motorola DSP56824ADM User Manual

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2.5.1

Clock Oscillator

A user-replaceable clock oscillator, U12, is provided to allow custom configuration of the

clock for the DSP56824. Any oscillator speed up to the maximum speed of the DSP can be

used. JG9 (see Clock Input Selection on page 2-8) allows using 3.3 V or 5 V oscillators.

2.5.2

Two on-board Light-Emitting Diodes (LEDs) are provided. LED1 is a power indicator

that shows when power is applied to the DSP56824ADM board. LED2 is a debugging

indicator. See PB14 Indicator LED Configuration on page 2-15 for more information on

LED2. Both LEDs are located next to J7, the power input connector.

2.5.3

Two on-board pushbutton switches are provided. S1 allows the user to generate a

hardware reset to the DSP56824. The RESET line on the DSP56824 is asserted low when

S1 is depressed. S2 asserts IRQA when it is depressed. S1 and S2 are located near J4 and

J5, the codec input and output connectors.

2.5.4

Four on-board test points are provided to allow for voltage reference connections. TP1

and TP2 are connected to analog ground. TP3 is connected to the 3.3 V supply. TP4 is

connected to the 5 V supply.

2.6

The DSP56824ADM board includes a number of configuration jumpers that allow the

user to modify the way in which the board is used in a particular application. The

following paragraphs give a detailed description of the function of the jumpers.

MOTOROLA

DSP56824ADM User's Manual

DSP56824ADM Technical Summary

2-7

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