8-bit adc from pic18f452 using mikroc compiler

[ali shaheen]

Hello

i am taking an analog input from ra1 and after the input is digitalized it give 10 bit digital data but i want only 8-bit data so that each voltage level is sampled 255 times not 1023 times....

Please help.....

Regards
ali shaheen

 

[FvM]

PIC A/D converters are implementing sucessive approximation, not sampling the data 1023 (better 1024) times. But if you consult the datasheet, you'll see, that setting control bit ADFM=0 places the ADC result left justified in the ADRESx register pair. So ADRESH holds an 8 Bit value, as required.

 

[deniah]

Result of A/D conversion is stored in ADRESH and ADRESL registers. To read 8-bit value of conversion you need to align data to the left and then read ADRESH register. Also you can discard 2 most significant bits from 10-bit result of conversion.
You have example 'ADC on Leds' in MikroC compiler folder.