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ADC Help!!!

Nigel Sk

I did the configuration for the ADC and use a 2V voltage supply as an analog input. But the LCD shows nothing. The board im using is C8051F206. The integrated ADC is 12bit. Also, Im using Port 1.7 as the analog input.

MOV AMX0SL,#2FH     ; Selects P1.7 as the input
MOV ADC0CF,#000H    ; 1 system clock and 1 gain
MOV ADC0CN,#0C1H
MOV ADC0L, #000H    ; ADC Data Word Register
MOV ADC0H, #000H    ; ADC Data Word Register
MOV ADC0LTH, #000H  ; ADC Less-Than High Byte Register
MOV ADC0LTL, #000H  ; ADC Less-Than Low Byte Register
MOV ADC0GTH, #0FFH  ; ADC Greater-Than High Byte Reg
MOV ADC0GTL, #0FFH  ; ADC Greater-Than Low Byte Reg



CONVERT:        SETB ADBUSY   ; starts conversion
        LCALL DELAY

POLL:   JB ADCINT,PRINT ;Poll to see whether conversio is done
        SJMP POLL

PRINT:   CLR ADCINT
        CLR RS
        MOV DAT,#0FH    ; On the LCD
        SETB EN
        LCALL DELAY
        CLR EN
        MOV A,ADC0H
        LCALL WRITE_TEXT
        RET

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