30.5.8.3 Parameter change request and change completion acknowledgment - PWM Output (LT Series)

Specify the output frequency and the ON duty value under "Request special I/O parameter change."

Setup Process

To set the output frequency and the ON duty value, change the parameter under "Request special I/O parameter change" in the system variable (#L_ExIOSpParmChg).

Then, acknowledge the completion under [Special I/O parameter change completed]. Bit positions of the request flag and completed flag differ depending on the CH to which you allocate PWM output.

1. Change the parameter under "Request special I/O parameter change" (#L_ExIOSpParmChg).
   #L_ExIOSpParmChg
   

   Request Special I/O Parameter Change

   

   This variable uses the CH specified in the I/O driver settings as the 4-bit configuration information to request the special I/O parameter change.

   a: CH1 special I/O parameter change request
   c: CH2 special I/O parameter change request
   e: CH3 special I/O parameter change request
   g: CH4 special I/O parameter change request

   You can also read the previous settings using the Operation bits below.

   b: CH1 special I/O parameter read request
   d: CH2 special I/O parameter read request
   f: CH3 special I/O parameter read request
   h: CH4 special I/O parameter read request

2. Acknowledge the completion in [Special I/O Parameter Change Completed]. Details of variables differ depending on the CH to which you allocate the counter, as in the following figure.

   Request Special I/O Parameter Change

   

   a: CH1 special I/O parameter change complete
   c: CH2 special I/O parameter change complete
   e: CH3 special I/O parameter change complete
   g: CH4 special I/O parameter change complete

   You can also read the previous settings using the watch bits below.

   b: CH1 special I/O parameter read complete
   d: CH2 special I/O parameter read complete
   f: CH3 special I/O parameter read complete
   h: CH4 special I/O parameter read complete

3. The figure below shows the flag timing chart for the special I/O parameter change request and completion.
   
   1) Set the output frequency and the ON duty value.
   2) Turn ON the request flag for the special I/O parameter change to change the parameter.
   3) Once the parameter is changed, the completion flag of the special I/O parameter change turns ON.
   4) Acknowledge that the completion flag of the special I/O parameter change is ON and turn OFF the request flag for the special I/O parameter change.
   5) When the request flag for the special I/O parameter is recognized as OFF, the completion flag of the special I/O parameter change turns OFF.