I have been tinkering around with a new project that needs to send Extended NEC protocol
  over IR.  The protocol uses a time based unit consisting of a pulse 2.25ms long with the
  first 560uS containing the 38khz modulation and the rest of the 2.25ms with no output.
  Similiarly a logical "0" is a 1.12ms pulse with the first 560uS containing the modulation.

  I have never used a hardware PWM port on the PIC before and am wondering if that is a more
  efficient way to go than to generate the 38khz in software.  I have been looking specifically
  at the PIC16F628.  I have 2 questions for the group. 1) Do you recommend using the hardware PWM
  for the modulation to simplify coding and 2) What is the "appropriate" way of turning the
  38khz on and off?  It looks like maybe enabling and disabling the associated TMR will do it,
  but is that the right way?

  Many thanks.
  -James
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