فرکانس موج مثلثی در حالت PH.pwm در تایمر های avr چگونه تعین می شود
اطلاعیه
Collapse
No announcement yet.
فرکانس pwm
Collapse
X
-
پاسخ : فرکانس pwm
سلام ..............
مطالب این تاپیک رو بخونید ، اگر سوالی بود ، مطرح کنید . موفق باشید.
http://www.eca.ir/forum2/index.php?topic=5671.60دوستان! مدتی کمتر به سایت میام ..
-
پاسخ : فرکانس pwm
سلام.
The PWM resolution for the phase correct PWM mode is fixed to eight bits. In phase
correct PWM mode the counter is incremented until the counter value matches MAX.
When the counter reaches MAX, it changes the count direction. The TCNT0 value will
be equal to MAX for one timer clock cycle. The timing diagram for the phase correct
PWM mode is shown on Figure 33. The TCNT0 value is in the timing diagram shown as
a histogram for illustrating the dual-slope operation. The diagram includes non-inverted
and inverted PWM outputs. The small horizontal line marks
The Timer/Counter Overflow Flag (TOV0) is set each time the counter reaches BOTTOM.
The Interrupt Flag can be used to generate an interrupt each time the counter
reaches the BOTTOM value.
In phase correct PWM mode, the compare unit allows generation of PWM waveforms on
the OC0 pin. Setting the COM01:0 bits to 2 will produce a non-inverted PWM. An
inverted PWM output can be generated by setting the COM01:0 to 3 (see Table 41 on
page 84). The actual OC0 value will only be visible on the port pin if the data direction
for the port pin is set as output. The PWM waveform is generated by clearing (or setting)
the OC0 Register at the compare match between OCR0 and TCNT0 when the counter
increments, and setting (or clearing) the OC0 Register at compare match between
OCR0 and TCNT0 when the counter decrements. The PWM frequency for the output
when using phase correct PWM can be calculated by the following equation:
The N variable represents the prescale factor (1, 8, 64, 256, or 1024).
امیدوارم مفید باشه . . .
دیدگاه
دیدگاه