mplab xc8 how to change timer frequency in code

There is a trade off between how much the microcontroller is asked to do When you put everything in an interrupt code - the whole thing can get hugeĪs in big code systems you have to do alot of different interrupts to service. Keep it short and sweet as it is still 'interrupt' code. Sepoarating it out is a matter of choice i.e. Put it all within the interrupt routine as it is part of the interrupt routine. Note: do_pwm() is called from within interrupt() - you could The first two routines setup and control the hardware timer to generate an

do_pwm() - Where the PWM signal is generated.

interrupt() - Updates the global variable 'timer' at Timer 0.

init_timer() - As it sounds initialises the hardware timer.

With this method you will not be able to get a lot of processing done at Since interrupts areįiring fast the main code can also not be very big. ISR (Interrupt Service Routine) has to be very small. With this method a timer is operated in quite a fast mode and this means the This example is from a 16F88 running an internal oscillator at 8MHz. So here Frequency = 1.65kHz Single Timer method : PIC PWM Interrupt - Timer initialization It depends on the application you are using. It isĪlthough 20 steps does not sound a lot if you use it as a light dimmer its more In the exampleīelow Timer 0 is used as the resolution timer and has a frequency of 33kHz or a Which is used as the resolution timer for the PWM period. The key to creating a PIC PWM is to use an interrupt from one of the timers Single Timer method : PWM PIC Interrupt driven timer

How much performance you need (this uses more modules i.e.

The second uses two timers but has extremely

There are two methods presented - the first uses one timer and does not have as This page shows you how to add a software controlled interrupt driven PWM Sometimes you need a Pulse Width Modulation signal because either the deviceĭoes not have an internal PWM peripheral or you need an extra one. All you do is send data to the duty cycle Peripherals that are easy to set up and use and once initialized willĬontinue running on their own. Some PIC Microcontrollers have built in PWM internal How to generate a PIC PWM using an interrupt. How to setup ATtiny for Ultra Low Power operation.Arduino Toggle Switch - using a standard push button.Arduino Oversampling: How to Get More ADC Bits with No Extra Hardware!.

Mplab xc8 how to change timer frequency in code