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Software PWM for AT89C2051

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crankler

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Is it possible to generate 2 pwm outputs from at89c2051? the pwm output should be configured from 5 - 10% duty cycle..
 

yes, with the help of timers you can generate 2 pwm.

What is the frequency of the pwm?
 
nandhu015 said:
yes, with the help of timers you can generate 2 pwm.

What is the frequency of the pwm?
Click to expand...

it may not be as efficient or accurate when changing the pwm at regular intervals
 
What is the frequency of the pwm?
Click to expand...

let's say 20 kHz, what should be the value of crystal oscillator to use?

it may not be as efficient or accurate when changing the pwm at regular intervals
Click to expand...

why? i was planning to have an interval 10 seconds and minimum of 8 duty cycles to choose from
 
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    gella

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i will be using 12kHz crystal oscillator.. what will be the frequency for 8-bit pwm output?

---------- Post added at 02:59 ---------- Previous post was at 02:56 ----------

..i mean 11.0592kHz oscillator
 
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    gella

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frequency is not concerned to crystal oscillator, but the timer values corresponding to the max frequency it can generate
 
crankler said:
i will be using 12kHz crystal oscillator.. what will be the frequency for 8-bit pwm output?

---------- Post added at 02:59 ---------- Previous post was at 02:56 ----------

..i mean 11.0592kHz oscillator
Click to expand...

It is not either 12kHz or 11.0592 kHz. It is 12MHz and 11.0592MHz
 
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frequency is not concerned to crystal oscillator, but the timer values corresponding to the max frequency it can generate
Click to expand...

what do you mean by timer values.. i'm using 11.0592 MHz crystal oscillator
 
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    gella

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THE MAXIMUM VALUES SUPPORTED BY PWM REGISTERS... there will be pwm registers, where we load the timer values for ON and OFF values and you vary the duty cycle...
 
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Can you please post a working sample program for PWM control? One which can control the brightness of an led, and maybe with a schematic?

I seem to have problems with interrupt.. Can I use polling instead?

Thanks!!!
 

gella said:
Can you please post a working sample program for PWM control? One which can control the brightness of an led, and maybe with a schematic?

I seem to have problems with interrupt.. Can I use polling instead?

Thanks!!!
Click to expand...


check this attachmevt
Ajitkumar
 

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  • uCTrainerKit.pdf
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