Posted: Sat Nov 22, 2014 6:10 pm Post subject: ADC noise (solved)
Solved! Although the periphery was disconnected from the PWM outputs,
the smoothing network was still connected resulting in power supply glitches when changing N.
Hi,
I am having a strange problem reading the ADC of Attiny841.
In the following code part I chose between increasing N via the For...Loop or setting N=100.
The ADC mode is free running.
Code:
Top: For N =1To255
N=100'<----Chose remarking or not remarking this statement
Ocr2a = N
Ocr2b = N
Waitus50
W =0
W1 = Adc
If W1.9 =1Then W1 = W1 Or&HFE00
W = W + W1
Print #1 , W ;Chr(13); Next Goto Top
Remarking the line N=100 the ADC values fluctuate by about 50 LSB.
Not remarking the line N=100 the ADC fluctuates only by about 5 LSB.
Is there any idea what might cause this problem (and how to fix it)?
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