Ever wanted more accuracy in the output of your PWMs? The new PIC16F1574 and PIC16F1764 family of devices both have a 16-bit PWM peripheral. The advantage of using a 16-bit PWM is that it increases the resolution of the PWM signal allowing for more precise duty cycles. Additionally each 16-bit PWM peripheral has an independent timer, this allows for generating the PWM without using one of the device's timers. The CCS C Compiler supports the new 16-bit PWM peripheral using either built-in functions or the #use pwm() library. The following is an example of how to use the #use pwm() library to setup the 16-bit PWM peripheral on a PIC16F1574:
#use pwm(output=PIN_C3, frequency=122Hz, bits=16, duty=50)
Because the 16-bit PWM peripheral has an independent timer and registers for setting the PWM signal's phase and offset, the following built-in functions have been added to the CCS C Compiler to set the period, phase and offset:
SET_PWMx_PERIOD() //x being the PWM peripheral
SET_PWMx_PHASE() //x being the PWM peripheral
SET_PWMx_OFFSET() //x being the PWM peripheral
The following is an example of how to use the built-in functions to setup the 16-bit PWM peripheral:
set_pwm1_period(0xFFFF); //8.192ms period, ~122Hz frequency
set_pwm1_duty(0x7FFF); //50% duty
The new built-in functions are available in IDE compilers and the PCM command-line compilers starting with version 5.056.
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