Jonas Leijon

ADC problems with MC9S08SG8

Discussion created by Jonas Leijon on Feb 1, 2010
Latest reply on Feb 2, 2010 by bigmac

Hi,

 

 

I have a strange problem using the ADC. 

I have no problem sampling 10-bit ADC values but when the value is stable around 768 (0b1100000000) I get "fake" values!!? Both 512 and 1023. This only occurs around 768. 

I have narrowed down the code only to read the ADC value to exclude that the code is wrong:

 

The code is now simply in a infinitive loop:

iLoad = ADCR; (iLoad is an integer)

 

I have tried longer sample time, digital buffer disable etc.. I suppose that there is something that I'm missing here!?

 

 

 

 

 I'm using the DEMO9S08SG8.

  

 

 

/Jonas

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