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PIC16F526-I/P 数据表(PDF) 62 Page - Microchip Technology |
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PIC16F526-I/P 数据表(HTML) 62 Page - Microchip Technology |
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62 / 122 page  PIC16F526 DS41326D-page 62 2010 Microchip Technology Inc. EXAMPLE 9-1: PERFORMING AN ANALOG-TO-DIGITAL CONVERSION EXAMPLE 9-2: CHANNEL SELECTION CHANGE DURING CONVERSION REGISTER 9-2: ADRES: A/D CONVERSION RESULTS REGISTER R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X R/W-X ADRES7 ADRES6 ADRES5 ADRES4 ADRES3 ADRES2 ADRES1 ADRES0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown ;Sample code operates out of BANK0 MOVLW 0xF1 ;configure A/D MOVWF ADCON0 BSF ADCON0, 1 ;start conversion loop0 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop0 MOVF ADRES, W ;read result MOVWF result0 ;save result BSF ADCON0, 2 ;setup for read of ;channel 1 BSF ADCON0, 1 ;start conversion loop1 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop1 MOVF ADRES, W ;read result MOVWF result1 ;save result BSF ADCON0, 3 ;setup for read of BCF ADCON0, 2 ;channel 2 BSF ADCON0, 1 ;start conversion loop2 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop2 MOVF ADRES, W ;read result MOVWF result2 ;save result MOVLW 0xF1 ;configure A/D MOVWF ADCON0 BSF ADCON0, 1 ;start conversion BSF ADCON0, 2 ;setup for read of ;channel 1 loop0 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop0 MOVF ADRES, W ;read result MOVWF result0 ;save result BSF ADCON0, 1 ;start conversion BSF ADCON0, 3 ;setup for read of BCF ADCON0, 2 ;channel 2 loop1 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop1 MOVF ADRES, W ;read result MOVWF result1 ;save result BSF ADCON0, 1 ;start conversion loop2 BTFSC ADCON0, 1;wait for ‘DONE’ GOTO loop2 MOVF ADRES, W ;read result MOVWF result2 ;save result CLRF ADCON0 ;optional: returns ;pins to Digital mode and turns off ;the ADC module |
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