You can read that in the manual which came to your version of PBP.
Here then a smal example with no comment. Try to find the comment in the manual.
Code:
@ DEVICE PIC16F877A,XT_OSC
@ DEVICE PIC16F877A,BOD_OFF
@ DEVICE PIC16F877A,LVP_OFF
@ DEVICE PIC16F877A,CPD_OFF
@ DEVICE PIC16F877A,PROTECT_OFF
DEFINE ADC_BITS 8
DEFINE ADC_CLOCK 3
DEFINE ADC_SAMPLEUS 50
DEFINE OSC 4
ADCON1 = %00000010
TRISA = %11111111
TRISB = %00000000
TRISC = %10000001
LEDPIN VAR PORTB.0
VALUE0 VAR BYTE
CLEAR
START: ADCIN 0,VALUE0
IF VALUE0 > 127 THEN
LEDPIN = 1
ELSE
LEDPIN = 0
ENDIF
GOTO START
END
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