;This program is a simple AD conversion demonstration program, which performs 0-5V voltage test
;The conversion result is output from port C and is very intuitive
;The converted value ADRESH is 0 at 0V, and the LEDs are all off, and all light up at 5V
;================================================
include
ORG 0X00
NOP
START
BCF STATUS,RP0
CLRF PORTC
MOVLW B'01000001' ;D7 D6=01 AD conversion clock frequency = FOSC/8
MOVWF ADCON0 ;D5 D4 D3=000 AD conversion analog channel selection RA0/AN0
;D2=0 AD completed or not in progress D0=0 turn off ADC
BSF STATUS,RP0
MOVLW B'10000111' ;D7=1 cancel pull-up, D6=0 INT falling edge trigger,
MOVWF OPTION_REG ;D5=0 TOCK1 uses internal clock D4=0 TOCK1 rising edge increment
; D3=0 for TMR0 D2 D1 D0=1 TMR0 1:256 division
CLRF TRISC
MOVLW B'00001110' ;D3 D2 D1 D0 1110 selects RA0 as the analog port.
MOVWF ADCON1; D7=0 left-aligned The lower six bits of ADRESL are read as 0
BCF STATUS, RP0
MAIN
BTFSS INTCON,T0IF ; Wait for TMR0 timer overflow interrupt
GOTO MAIN
BCF INTCON,T0IF ; Clear TMR0 timer overflow flag
BSF ADCON0,GO ; Turn on A/D
WAIT
BTFSS PIR1,ADIF ; Wait for A/D to complete
GOTO WAIT
MOVF ADRES,W ; A/D value is output from PORTC
MOVWF PORTC
GOTO MAIN
END
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