FREQOUT - PWM question

[mister_e]

Yes the internal CCP module set in PWM will handle it for you AND in background.

Depending you OSC speed you'll have more or less DutyCycle resolution. But anyway, you want it 50% right?

Unfortunately due to it's limitations, PBP HPWM won't help. You'll need to calculate and write the right value to the PIC registers.

To do ALL related calcs, i will suggest to use my PicMultiCalc available bellow
http://www.mister-e.org/pages/utilitiespag.html

Once you have it, it's piece of cake.

Here's something working @4MHZ

        '
        '       38KHz PWM @ 4MHZ using a PIC16F877
        '       ----------------------------------
        @  __CONFIG _XT_OSC & _LVP_OFF
        '
        '
        TRISC = 0
        Duty        var byte
        
        '
        '       PWM SETUP
        '       =========
                ' PicMultiCalc says..
                '   Duty value for 50%=52
                '   PR2 = 25
                '   PRESCALLER 1:1
                '   
                '
        duty = 52                           ' duty value for 50% duty cycle
        PR2 = 25                            '
        T2CON = %00000100                   ' timer2 on, prescale 1:1
        CCPR1L = duty>>2                    ' MSB of duty cycle value
        CCP1CON=%00001100 | (dUTY<<5)       ' set PWM mode and store the 
                                            '   2 LSB of duty        
SpinInRound:
        goto spininround

also have a look to those...
http://rentron.com/PicBasic/IR_Chips.htm
http://rentron.com/IR_TO_RF.htm
http://rentron.com/Infrared_Communication.htm