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Ok. I will check in the simulation what is causing the delay. But one thing I am confused is about those slowly incrementing values. I don't know why I see like 4mA, 8 mA, 16mA,,..... finally stable value of 100mA. I don't know why it is not just showing me 100mA directly.
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If your adc data is a constant (or so) then your accumulator (plus division by 256) will build up from zero gradually then settle at the constant value when sample 255 arrives from stage 255 i.e. it should be within msec not second. during this initial time there is subtraction from zero and so the summed up total divided by 2^8 will be less than constant until all 256 samples are added and divided by 2^8 to equal the constant. Thereafter any new sample arrival is added but last one subtracted leading to same constant.
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