參數(shù)資料
型號： KSZ8864RMNI
廠商： Micrel Inc
文件頁數(shù)： 95/111頁
文件大?。?/td> 0K
描述： IC ETHERNET SWITCH 4PORT 64QFN
特色產(chǎn)品： KSZ8864RMN Ethernet Switches
標準包裝： 348
系列： *
其它名稱： 576-3995
PIC16C9XX
DS30444E - page 84
1997 Microchip Technology Inc.
12.4
A/D Conversions
Example 12-2 show how to perform an A/D conversion.
The RA pins are congured as analog inputs. The ana-
log reference (VREF) is the device VDD. The A/D inter-
rupt is enabled, and the A/D conversion clock is FRC.
The conversion is performed on the RA0 pin
(channel0).
Note:
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
Clearing the GO/DONE bit during a conversion will
abort the current conversion. The ADRES register will
NOT be updated with the partially completed A/D con-
version sample. That is, the ADRES register will con-
tinue to contain the value of the last completed
conversion (or the last value written to the ADRES reg-
ister). After the A/D conversion is aborted, a 2TAD wait
is required before the next acquisition is started. After
this 2TAD wait, an acquisition is automatically started on
the selected channel.
EXAMPLE 12-2: DOING AN A/D CONVERSION
BCF
STATUS, RP1
; Select Bank1
BSF
STATUS, RP0
;
CLRF
ADCON1
; Configure A/D inputs
BSF
PIE1,
ADIE
; Enable A/D interrupts
BCF
STATUS, RP0
; Select Bank0
MOVLW
0xC1
; RC Clock, A/D is on, Channel 0 is selected
MOVWF
ADCON0
;
BCF
PIR1,
ADIF
; Clear A/D interrupt flag bit
BSF
INTCON, PEIE
; Enable peripheral interrupts
BSF
INTCON, GIE
; Enable all interrupts
;
Ensure that the required acquisition time for the selected input channel has elapsed.
;
Then the conversion may be started.
;
BSF
ADCON0, GO
; Start A/D Conversion
:
; The ADIF bit will be set and the GO/DONE bit
:
;
is cleared upon completion of the A/D Conversion.
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