Real Time Devices DM6804 FM Capture

DM6804 FM Capture block (not recommended)


Simulink® Real-Time™ Library of Drivers No Longer Recommended for Use


This block programs the AMD9513A for capturing FM signals.

There is one output for relative frequency compared to the base frequency. To get the actual frequency, multiply the base frequency by the relative frequency.

The FM signal has to enter the pin named GATE of the corresponding counter channel. The CLK pin has to be left unconnected.

Scaling Input to Output

Hardware Output

Block Input Data Type




0 to 1

Block Parameters


From the list, choose 1, 2, 3, 4, or 5. This selects which counter the driver block uses to determine the FM. One block is required for each counter used.

Frequency base

From the list, choose F1=5MHz, F2=500kHz, F3=50kHz, F4=5kHz, or F5=500Hz to set the base frequency.

Sample time

Enter the base sample time or a multiple of the base sample time. The sample time indicates the update rate of registration on the input (Duty Cycle)

Base address

Enter the base address of the board. This entry must correspond to the DIP switch setting on the board. For example, if the DIP switch setting is 300 (hexadecimal), enter 0x300.

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