Microchip doesn't make a PIC 16F18131. Perhaps you could recheck that part number.

 

Also, I'd switch to MPLAB X IDE v 5.20, I personally found v5.35 to be flakey when programming in Assembly language on some microcontrollers. Are you using Pickit 2,3 or 4?

 

I'm taking advantage of the fact that the hardware allows a left justified 10 bit word to control the PWM duty cycle. The bottom 6 bits are ignored. fine_duty_ctr is a 4 bit counter that decides when bit 7 of the PWM is toggled to a 1.

I remember that PWM register now - it's a while since I last used a PIC.

 

Microchip doesn't make a PIC 16F18131. Perhaps you could recheck that part number.

Sorry, it is 16F18313 I have Pickit 2 & 3, P3 requires powering up in the right sequence, in order to get it to connect in v8.92.
Cannot access any kind of assembly debug routines in V5.35

 

Max, I suppose you're used to working in assembly, but I can't imagine programming without a compiler.

 

Max, I suppose you're used to working in assembly, but I can't imagine programming without a compiler.

I can compile the code in V5.35, just that I cannot find any way to use what in V8.92 is the 'Watch' screen to monitor registers etc while stepping thro code.

 

I've never used the PWM module in these microcontrollers so now you've given me a reason to dim the lights with it. cool.

 

I've never used the PWM module in these microcontrollers so now you've given me a reason to dim the lights with it. cool.

The only reason I am using the eight pin 16f18313 for PWM, is I need to re-assign the PWM output to different pins each few seconds.

 

I can compile the code in V5.35, just that I cannot find any way to use what in V8.92 is the 'Watch' screen to monitor registers etc while stepping thro code.

You can add a register from menu Debug>New Watch. You can also view PIC memories under Window>Pic Memory views

 

I've never used the PWM module in these microcontrollers so now you've given me a reason to dim the lights with it. cool.

There's so many different things you can do with PWM from playing simple audio clips to modifying the audio attack, level, decay profile of a simple fixed frequency buzzer for different types of chirps or clicks.

 

Update: LED Dimming:
Found I got satisfactory results by just incrementing and decrementing the PWM timer value one bit at a time. also saves the large look-up table.