Generate a 120Khz signal using the pic16F877a

[texas5]

i try to generate a 120khz signal using pin 17(rc2/ccp1) of pic16f877a.i use 8Mhz osc.the code as shown below(search from internet):

void main()
{
TRISC = 0 ;

/*
* PWM registers configuration
* Fosc = 8000000 Hz
* Fpwm = 117647.06 Hz (Requested : 120000 Hz)
* Resolution is 6 bits
* Prescaler is 1
* Ensure that your PWM pin is configured as digital output
* see more details on http://www.micro-examples.com/
* this source code is provided 'as is',
* use it at your own risks
*/
PR2 = 0b00010000 ;
T2CON = 0b00000100 ;
CCPR1L = 0b00001000 ;
CCP1CON = 0b00011100 ;
}

are those coding will work.can someone help me briefly translate it into basic pro language cause i use microcode studio basic pro to compile.hope mr skimask would help me once again.

[skimask]

are those coding will work.can someone help me briefly translate it into basic pro language cause i use microcode studio basic pro to compile.hope mr skimask would help me once again.

I don't see a lot of helping going on...
Why don't you try coding it yourself...then when it doesn't work right, I'll jump in and help you fix it.

[texas5]

this is my coding:

DEFINE OSC 8
DEFINE CCP1_REG PORTC 'Hpwm 1 pin port
DEFINE CCP1_BIT 2 'Hpwm 1 pin bit


HPWM 1,127,120000 ' Send a 50% duty cycle PWM signal at 120kHz

the problem is i can't compile.it says "120000 numeric overflow, value truncated"

[rhino]

From the manual

5.29. HPWM
HPWM Channel,Dutycycle,Frequency

....Not all frequencies are available at all oscillator settings. The highest
frequency at any oscillator speed is 32767Hz.

[skimask]

Manual? What's that?

That being said...
PIC16F877A datasheet, DS39582B, Table 8-3, Page 68, says you can do 156.3Khz with a 7 bit resolution...if capable of manually setting the registers 'by hand'...

And I'm not 100% sure, but I think with PBPL, you can actually set those frequencies to a much higher value, as long as you're using PBPL and an 18F series PIC. I know I've got a LONG variable driving my HPWM on my 18F4685...can't remember if it goes over 32767 though...

[rhino]

So in other words, you won't be able to use the HPWM command for that high of a frequency. But as Skimask points out, you can achieve that frequency by setting up the PWM registers manually. As mentioned, section 8.3 of the PIC16F87XA datasheet will explain this. If you get stuck, ask.... I've never set these up before, but I'm pretty confident someone here can guide you.