Specifications

15 Real Time Devices

The DM6804 FM & ARM driver programs the AM9513A for FM (Frequency

Modulation) signal generation (a square wave with fixed duty cycle and

variable frequency). Additionally the driver allows to arm and disarm the

counter by the second block input.

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. The XTAL frequency is

assumed to be 1MHz, therefore the jumper on the DM6804 has to be in position

1MHz not 5MHz.

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

Initial Relative Output Frequency defines the initial output frequency of the

FM-signal relative to the Frequency Base during driver initialization.

For example, if the initial 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

Initial Relative Output Frequency. 500kHz x 0.175 = 87.5 kHz

Duty Cycle. Enter a value between 0 and 1 to set the duty cycle. The Duty

Cycle is held fixed during simulation.

Initial Toggle State - From the list, choose high or low. The Initial Toggle

State sets the initial digital level (high or low) of the output. For example, if

the Duty Cycle is 0.25 and the Initial Toggle State is High, the first 25% of the

period will have a high level and the last 75% will have a low level.

Initial ARM State - From the list, choose Disarmed or Armed. The Initial

ARM State defines if the counter should be armed or disarmed after driver

initialization. The ARM State during a simulation can be controlled by the

Hardware Output Block Input Data Type Scaling

TTL Variable frequency: double

Arm: double

<0.5 disarmed

0.5 armed