參數(shù)資料
型號(hào)： MCV14AI/P
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PDIP14
封裝： 0.300 INCH, ROHS COMPLIANT, PLASTIC, DIP-14
文件頁數(shù)： 50/84頁
文件大?。?/td> 1007K
代理商： MCV14AI/P
MCV14A
DS41338B-page 52
Preliminary
2009 Microchip Technology Inc.
EXAMPLE 8-1:
PERFORMING AN
ANALOG-TO-DIGITAL
CONVERSION
EXAMPLE 8-2:
CHANNEL SELECTION
CHANGE DURING
CONVERSION
REGISTER 8-2:
ADRES: ADDRESS REGISTER
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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