参数资料
型号: AT90LS2343-1SI
厂商: Atmel
文件页数: 45/63页
文件大小: 0K
描述: IC MCU 2K FLASH 1MHZ IND 8-SOIC
标准包装: 95
系列: AVR® 90LS
核心处理器: AVR
芯体尺寸: 8-位
速度: 1MHz
连通性: SPI
外围设备: 欠压检测/复位,POR,WDT
输入/输出数: 5
程序存储器容量: 2KB(1K x 16)
程序存储器类型: 闪存
EEPROM 大小: 128 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 2.7 V ~ 6 V
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 8-SOIC(0.209",5.30mm 宽)
包装: 管件
PIC16C433
DS41139B-page 48
Preliminary
2002 Microchip Technology Inc.
8.4
A/D Conversions
Example 8-2 shows how to perform an A/D conversion.
The GPIO pins are configured as analog inputs. The
analog reference (VREF) is the device VDD. The A/D
interrupt is enabled and the A/D conversion clock is
FRC. The conversion is performed on the GP0 channel.
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 8-2:
DOING AN A/D CONVERSION
Note:
The GO/DONE bit should NOT be set in
the same instruction that turns on the A/D.
BSF
STATUS, RP0
; Select Page 1
CLRF
ADCON1
; Configure A/D inputs
BSF
PIE1,
ADIE
; Enable A/D interrupts
BCF
STATUS, RP0
; Select Page 0
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 sampling 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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