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ADC 0844 errorneous results. Help me.
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Arun Kumar V
Thu Jul 31 2008, 03:14AM

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Hi Freddy,

I recalculate the formula, I still think that my 1 second delay is correct. I'm using 11.0592 MHz


your calculation is based on 12Mhz crystal freq, my guess proved correct that you are using 11.0592Meg xtal.

so here is the calculation for 10mSec delay using 11.0592 meg ( 10mS X 100 times =1sec):

1) 10,000 divided by 1.085uS = 9216 decimal
2) 65536 - 9216 = 56,320 decimal
3) 56,320 d = 0DC00h
4) TH0 = 0DCh , TL0 = 00h

you can cross check by multiplying 9216 X 1.085 = 9999.36 uSec

but your values give a delay of 10,000 X 1.085 = 10,850 uSec a delay


about the variation in reading, i'll find let you where the error is



Arun






[ Edited Thu Jul 31 2008, 03:16AM ]
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 Freddy 
Freddy
Fri Aug 01 2008, 10:05AM

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Yup, got it now. Thank you so much Arun
I think I'll switch to 12 MHz

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