Documentation

Measurement Computing CIO-CTR10 Counter FM

CIO-CTR10 Counter FM block (not recommended)

Library

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

Note

The CIO-CTR10 has two AM9513A chip with ten counters.

The CIO-CTR10 FM driver programs the AM9513A for FM (Frequency Modulation) signal generation (a square wave with fixed duty cycle and variable frequency). For the corresponding counter channel, the PWM signal is output at the pin named OUT.

Scaling Input to Output

I/O Module Output

Block Input Data Type

Scaling

TTL

Double

0 to 1

Block Parameters

Counter

From the list, choose 1, 2, 3, 4, or 5 to select which counter is used with this driver block. One block is required for each counter used.

Frequency base

From the list, choose F1=1MHz, F2=100kHz, F3=10kHz, F4=1kHz, or F5=100Hz to set the base frequency. XTAL frequency is assumed to be 1 MHz, therefore the jumper on the CIO-CTR10 has to be in position 1 MHz not 5 MHz.

Output duty cycle

Enter a value between 0 and 1 to set the duty cycle of the square wave. The Duty Cycle is held fixed during execution of the real-time application.

Level sequence of square wave

From the list, choose either high-low or low-high:

  • If you choose high-low, the square wave period starts with the TTL high part followed by the TTL low part.

  • If you choose low-high, the square wave period starts with the TTL low part followed by the TTL high part.

In either case, the duty cycle entering the block defines the duration of the TTL high part.

Level when disarmed

From the list, choose either high or low. The counter is automatically disarmed when the real-time application is not running and gets armed when the application begins running. This parameter sets the TTL level when the counter is disarmed.

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.

Was this topic helpful?