User`s guide

Tar get Preferences

Correctly generating interrupts for yo ur model depends on the

clock rate of the CPU on your processor. You can change the

rate w ith the DIP switches on the board or from one of the Texas

Instruments software utilities.

For the timer software to calculate the interrupts correctly,

Embedded IDE Link CC needs to know the actual clock rate of

your processor as you conﬁgured it. CPU clock speed lets y ou tell

the timer the rate at which your processor CPU runs, which is the

rate to use to m atch the CPU rate.

The timer uses the CPU clock rate you specify in CPU clock

speed to calculate the time for each interrupt. For example, if

your model includes a sine wave generator block running at 1 k Hz

feeding a signal into an FIR ﬁlter block, the timer needs to create

interrupts to generate the sine wave samples at the proper rate.

Using the clock rate you choose,

100 MHz for example, the timer

calculates the sine generator interrupt period as follows for the

sine block:

• Sine block rate = 1 kHz, or 0.001 s/sample

• CPU clock rate = 100 MHz, or 0.000000001 s/sample

To create sine block interrupts at 0.001 s/sam ple requires:

100,000,000/1000 = 1 Sine block interrupt per 100,000 clock ticks

Thus, y ou must report the correct clock rate, or the interrupts

come at the wrong times and the results are incorrect.

Simulator

Select this option wh en you are developing for a simulator rather

than a hardware processor. You must select Simulator to

processor your co de to a C6xxx simulator.

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