16f628 PWM pin, winpicprog, and simulator

[max_imum2000]

hello
i am trying to output pwm signal from 16f628 pic.
i tried many already made program from the net to do so
and i am using oshonsoft IDE simulator.
i am just seeing changes on TMR2 only
i cant seem to see any pin that has any activity
why is that ?
can anyone just send me a simple hex file (along with asm or basic program please) to output PWM to portA or portB ??
just as an example

i tried the progam in winpicprog but my assemble cant convert it to hex file and giving me many errors.

please help
i will appricate more in depth tutorial on the subject if possible

thank you

 

[upand_at_them]

Why can't you compile it in MPLAB?

Mike

 

[Mike - K8LH]

Are you looking at the correct pin? On the '628A the PWM output is on RB3/CCP1 (pin 9)...

Good luck... Regards, Mike

 

[max_imum2000]

actually i am looking at all the pins at the same time
i even compiled the program in winpicprog tutorial using mplab
same thing , all the activity is on tmr2

what am i missing,
i know i should see any activity on rb3 but there arent any

 

[Mike - K8LH]

Ok, I've got a small example assembly program for a '628A with a 20-MHz xtal oscillator...

Which PIC are you running, the '628 or '628A? What oscillator are you running? Are you only simulating this (no actual hardware to test)?

Regards, Mike

 

[max_imum2000]

i am running 628A . 20mhz
for now i am only simulating
next step is real testing

thanks

 

[Mike - K8LH]

Then I wonder if the Simulator simply isn't showing the PWM output on the RB3/CCP1 pin? Or, perhaps you're not setting up a Project correctly with the ASM code examples? Lots of variables there...

Anyway, here's a rude-n-crude circuit and code example... The RC Integrator / Filter allows you to measure a voltage at the R3/C3 junction that corresponds to the PWM setting... Adjust the PWM setting up or down using the '>' and '<' keys in Hyperterminal...

Good luck... Have fun... Kind regards, Mike

 

[max_imum2000]

well i think you r correct, maybe the simulator just not showing the pwm
output
i have to physically test the circuit i guess

thankt for your help