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PIC12F683 Datasheet(PDF) 62 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 62 Page - Microchip Technology |
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62 / 148 page  PIC12F683 DS41211B-page 60 Preliminary 2004 Microchip Technology Inc. 9.1.7 CONFIGURING THE A/D After the A/D module has been configured as desired, the selected channel must be acquired before the conversion is started. The analog input channels must have their corresponding TRISIO bits selected as inputs. To determine sample time, see Section 15.0 “Electri- cal Specifications”. After this sample time has elapsed, the A/D conversion can be started. These steps should be followed for an A/D conversion: 1. Configure the A/D module: • Configure analog/digital I/O (ANSEL) • Configure voltage reference (ADCON0) • Select A/D input channel (ADCON0) • Select A/D conversion clock (ANSEL) • Turn on A/D module (ADCON0) 2. Configure A/D interrupt (if desired): • Clear ADIF bit (PIR1<6>) • Set ADIE bit (PIE1<6>) • Set PEIE and GIE bits (INTCON<7:6>) 3. Wait the required acquisition time. 4. Start conversion: • Set GO/DONE bit (ADCON0<1>) 5. Wait for A/D conversion to complete, by either: • Polling for the GO/DONE bit to be cleared (with interrupts disabled); OR • Waiting for the A/D interrupt 6. Read A/D Result register pair (ADRESH:ADRESL), clear bit ADIF if required. 7. For next conversion, go to step 1 or step 2 as required. The A/D conversion time per bit is defined as TAD. A minimum wait of 2 TAD is required before the next acquisition starts. EXAMPLE 9-1: A/D CONVERSION ;This code block configures the A/D ;for polling, Vdd reference, R/C clock ;and GP0 input. ; ;Conversion start & wait for complete ;polling code included. ; BSF STATUS,RP0 ;Bank 1 MOVLW B’01110001’ ;A/D RC clock MOVWF ANSEL ;Set GP0 to analog BSF TRISIO,0 ;Set GP0 to input BCF STATUS,RP0 ;Bank 0 MOVLW B’10000001’ ;Right, Vdd Vref, AN0 MOVWF ADCON0 CALL SampleTime ;Wait min sample time BSF ADCON0,GO ;Start conversion BTFSC ADCON0,GO ;Is conversion done? GOTO $-1 ;No, test again MOVF ADRESH,W ;Read upper 2 bits MOVWF RESULTHI BSF STATUS,RP0 ;Bank 1 MOVF ADRESL,W ;Read lower 8 bits MOVWF RESULTLO |
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