MATLAB XPC TARGET 4 - DEVICE DRIVERS Spécifications télécharger pdf (Page 608)

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15 Real Time Devices

Port - From the list choose either A, B, or C. The port name defines which port

is used for this driver block. Each port has a maximum of 8 digital lines that

can be configured as outputs. In each case, one block is needed for each port.

Sampletime - Enter a base sample time or a multiple of the base sample time.

BaseAddress - Enter the base address of the board. This entry must

corresponds to the DIP-switch settings on the board. For example, if the base

address is 300 (hexadecimal), enter

0x300

DM6804 Counter PWM

The DM6804 has one AM9513A chip with 5 counters.

The DM6804 PWM driver programs the AM9513A for PWM (Pulse Width

Modulation) signal generation (a square wave with fixed frequency and

variable duty cycle). The block has one input which defines the variable duty

cycle between 0 and 1.

Scaling Input to Output

Driver Block Parameters

Counter. From the list, choose 1, 2, 3, 4, or 5 to select which counter is used

with this driver block. In each case, one block is needed for each counter.

Frequency Base -From the list, choose F1=5MHz, F2=500kHz, F3=50kHz,

F4=5kHz, or F5=500Hz to set the base frequency.

Relative Output Frequency - Enter a value between 0 and 1. The Relative

Output Frequency is multiplied by the FrequencyBase to set the fixed

output frequency of the PWM-signal.

For example, if the output frequency of a square wave has to be 17.5 kHz, then

choose F2=500kHz as the Frequency Base and enter

0.175 as the Relative

Output Frequency. 500kHz x 0.175 = 87.5 kHz

Hardware Output Block Input Data Type Scaling

TTL double 0 to 1

1 2 ... 603 604 605 606 607 608 609 610 611 612 613 ... 652 653

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MATLAB XPC TARGET 4 - DEVICE DRIVERS Spécifications Page 608

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