Specifications

15 Real Time Devices

Relative Output Frequency - Enter a value less than 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

Initial Duty Cycle - Enter a value between 0 and 1 to set the initial duty cycle.

The Duty Cycle defines the duty cycle at the initialization phase of the driver

similar to a initial value of an integrator.

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 Initial 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

second block input. If a value 0 is asserted, the counter is disarmed. If a value

1 is asserted, the counter gets armed.

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)

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 FM

The DM6804 has one AM9513A chip with 5 counters.

The DM6804 FM driver programs the AM9513A for FM (Frequency

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

variable frequency).