[SOLVED] How can I produce 9Khz PIC16F628A - MikroC

[Aseng]

Hi all Members,
Can anyone one here help me.

I want to get at a pin with PIC16F628A to produce frequency at 9Khz with external crystal oscillator 4mhz.


Thanks.
Ase.

 

[KlausST]

Hi,

microchip has application notes about the use of timer/counters and frequency generation.

There are a lot forum threads.
There are internet tutorials, example code, even videos.

************
Show what documents/informations you refer to.
Show what your idea is, your calculations, your code.
Tell us what you expected and what you see instead.
Ask elaborated (and not global "can anybody help") questions.

In short: show your effort ... and there will be many people here to help you.


Klaus

 

[betwixt]

How accurate does it have to be?

If 9.009KHz is near enough you can use the PWM module:
PR2 =0x6E
T2CON = 0x04
CCPR1L = 0x37
CCP1CON = 0x1C

That will give a 50% square wave, if you want to vary the pulse width without changing frequency, change the values in CCPR1L and CCP1CON.

Brian.

 

[Aseng]

Hi Brian,
I forgot to attached the picture, here is the simulation as well as your advice.

Dank Jee Well.

 

[TheMartian]

Use mikroC Timer Calculator

 

[Aseng]

Hi TheMartin,
Could you please show me your code use mikroC Timer Calculator.

 

[baileychic]

Try this code.

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Code C - [expand]
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void main() {
    CMCON = 0x07;
    
    TRISA = 0x00;
    TRISB = 0x00;
    
    PORTA = 0x00;
    PORTB = 0x00;
    
    PWM1_Init(9000);
    PWM1_Set_Duty(127);
    PWM1_Start();
    
    while(1) {
    
    
    }
}

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